Incident: Xperia Z Power Glitch: Sudden Shutdown Issue Impacting Users.

Published Date: 2013-03-22

Postmortem Analysis
Timeline 1. The software failure incident with Sony's Xperia Z occurred in March 2013 as reported in Article [17696].
System 1. Sony Xperia Z smart phone [17696]
Responsible Organization 1. Sony - Sony was responsible for causing the software failure incident with the waterproof Xperia Z smart phone [17696].
Impacted Organization 1. Xperia Z owners [17696]
Software Causes 1. The software cause of the failure incident was a power glitch that caused the Xperia Z smart phone to suddenly power down without warning [17696].
Non-software Causes 1. Hardware malfunction leading to sudden power downs [17696]
Impacts 1. Some Xperia Z owners experienced sudden power downs without warning, leading to frustration and inconvenience [17696]. 2. Users reported instances of the phone becoming totally dead or unresponsive, causing disruption in their daily usage [17696]. 3. The software failure incident resulted in Sony issuing an apology and acknowledging the problem, leading to a loss of customer trust in the device's reliability [17696].
Preventions 1. Implementing more rigorous testing procedures during the development phase to catch power glitches before the product is released to the market [17696]. 2. Conducting thorough quality assurance checks to identify and address any potential software bugs or faults that could lead to unexpected shutdowns [17696]. 3. Enhancing the monitoring and feedback mechanisms to quickly identify and address emerging issues reported by users, such as sudden power downs, before they become widespread problems [17696].
Fixes 1. A software update (10.1.A.1.434) released by Sony [17696]
References 1. Disgruntled forum members on Sony's official forum [17696] 2. Sony support member who posted in the forum thread [17696] 3. XDA-developers thread reporting on a software update [17696] 4. Statement from Sony apologizing for the glitch [17696]

Software Taxonomy of Faults

Category Option Rationale
Recurring one_organization (a) The software failure incident related to the Xperia Z power glitch happened again within the same organization, Sony. The article mentions that Xperia Z owners have been experiencing the issue of the phone suddenly powering down without warning, and Sony acknowledged the problem. A Sony support member mentioned that a fix for the glitch would be implemented in the next software update for the phone [17696]. (b) There is no information in the article about the software failure incident happening again at other organizations or with their products and services.
Phase (Design/Operation) design, operation (a) The software failure incident related to the design phase is evident in the article. Sony's waterproof Xperia Z smartphone faced a power glitch that caused the phone to suddenly power down without warning. This issue was reported by Xperia Z owners on Sony's official forum, indicating a problem introduced during the system development or updates. Sony acknowledged the glitch and mentioned that a fix would be implemented in the next software update for the phone [17696]. (b) The software failure incident related to the operation phase is also highlighted in the article. Users reported instances where their Xperia Z phones suddenly switched off without any apparent reason during normal operation. Some users mentioned that the phone could be restarted by holding down the power and volume buttons, indicating issues arising from the operation or use of the system [17696].
Boundary (Internal/External) within_system (a) The software failure incident related to the Sony Xperia Z power glitch is within the system. The issue causing the phone to suddenly power down without warning is identified as a bug within the device itself. Sony acknowledges the problem and mentions that a fix will be implemented in the next software update for the phone [17696].
Nature (Human/Non-human) non-human_actions, human_actions (a) The software failure incident in the Sony Xperia Z smartphones was attributed to a power glitch that caused the phones to suddenly power down without warning. This glitch was reported by disgruntled forum members, indicating a failure due to contributing factors introduced without human participation [17696]. Sony acknowledged the issue and mentioned that a fix for the glitch would be implemented in the next software update for the phone [17696]. (b) On the other hand, the software failure incident also involved human actions in the form of Sony's support member posting in the forum thread to communicate that the problem had been identified and that a fix would be implemented in the next software update [17696]. Additionally, Sony issued a statement apologizing for the glitch and advised affected customers to contact their local customer support center for assistance in resolving the issue, indicating human involvement in addressing the software failure [17696].
Dimension (Hardware/Software) hardware (a) The software failure incident related to the Xperia Z smartphone being plagued by a power glitch is attributed to hardware issues. Sony acknowledged the problem and mentioned that a fix for the glitch would be implemented in the next software update for the phone [17696].
Objective (Malicious/Non-malicious) non-malicious (a) The software failure incident related to the Sony Xperia Z power glitch is categorized as non-malicious. The issue was identified as a bug affecting a "very small number of devices" and causing the phone to suddenly power down without warning. Sony acknowledged the problem and mentioned that a fix would be implemented in the next software update for the phone [17696].
Intent (Poor/Accidental Decisions) accidental_decisions (a) The software failure incident related to the Sony Xperia Z power glitch does not seem to be directly attributed to poor decisions. Instead, it appears to be a technical issue with the device itself, as acknowledged by Sony. The company identified the problem and mentioned that a fix would be implemented in the next software update [17696]. (b) The incident can be categorized more as an accidental decision or unintended consequence rather than a poor decision. Users reported sudden power downs of the Xperia Z without warning, indicating a technical glitch rather than a deliberate poor decision by the company. Sony apologized for the issue and reassured customers that it was affecting only a small number of devices [17696].
Capability (Incompetence/Accidental) development_incompetence, accidental (a) The software failure incident related to development incompetence is evident in the article as Sony's waterproof Xperia Z smartphone faced a power glitch that caused the phone to suddenly power down without warning. This issue affected a number of devices, as reported by disgruntled forum members [17696]. Sony acknowledged the problem and mentioned that a fix for the glitch would be implemented in the next software update for the phone. This indicates that the issue was a result of a lack of professional competence in the development process, leading to the power-related bug in the Xperia Z. (b) The software failure incident related to accidental factors is also apparent in the article. Sony mentioned that the power glitch affecting the Xperia Z was only impacting a very small number of devices. This suggests that the issue was not intentionally introduced but rather occurred accidentally during the development or manufacturing process. Sony apologized for the glitch and reassured customers that the problem was affecting only a limited number of devices, indicating that the issue was accidental rather than deliberate [17696].
Duration temporary (a) The software failure incident related to the Xperia Z power glitch was temporary. The issue was reported by Xperia Z owners who complained about their phones suddenly powering down without warning. Sony acknowledged the problem and mentioned that a fix would be implemented in the next software update for the phone [17696]. Additionally, a software update (10.1.A.1.434) was made available to address the issue, indicating that the failure was not permanent but rather a temporary glitch that could be resolved through a software update.
Behaviour crash (a) crash: The software failure incident described in the article is related to a crash. Xperia Z owners have reported that their phones suddenly power down without warning, leading to a situation where the system loses state and stops performing its intended functions [17696]. (b) omission: The software failure incident does not seem to be related to omission, where the system omits to perform its intended functions at an instance(s) [17696]. (c) timing: The software failure incident is not related to timing issues, where the system performs its intended functions correctly but too late or too early [17696]. (d) value: The software failure incident is not related to value issues, where the system performs its intended functions incorrectly [17696]. (e) byzantine: The software failure incident is not related to byzantine behavior, where the system behaves erroneously with inconsistent responses and interactions [17696]. (f) other: The behavior of the software failure incident in this case is specifically described as a power glitch that causes the phone to suddenly power down without warning, indicating a crash scenario [17696].

IoT System Layer

Layer Option Rationale
Perception None None
Communication None None
Application None None

Other Details

Category Option Rationale
Consequence property, delay, theoretical_consequence The consequence of the software failure incident related to the Xperia Z power glitch was mainly inconvenience and potential harm to the users' devices. Users reported their phones suddenly powering down without warning, leading to frustration and inconvenience [17696]. Sony acknowledged the issue and mentioned that a fix would be implemented in the next software update for the phone [17696]. The software update (10.1.A.1.434) was made available, but it was not clear if it completely resolved the problem [17696]. Overall, the reported consequence of the software failure incident was mainly inconvenience and potential harm to the affected devices.
Domain information (a) The failed system in this incident was related to the information industry as it involved Sony's Xperia Z smartphone experiencing a power glitch that caused the phone to suddenly power down without warning. Users reported issues with the device, such as it being totally dead or dying multiple times in a day, indicating a software failure affecting the functionality of the smartphone [Article 17696].

Sources

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