My Sony Xperia M5 is not booting up. The screen is off, no LEDs are lit, it doesn't react to any buttons. It already happened several times. I wasn't doing anything specific, just was using it normally, and then suddenly it would hang up. This last time it happened while it was charging.
- After about 9 months of usage, it went into a boot loop, which I was able to resolve by switching it off/on (with a hidden power button). It took several attempts, though.
- About 2 or 3 weeks later, it went into a boot loop again. This time switching it off didn't help, so I tried resetting the firmware using the official tool from Sony. It didn't help either, so I brought it to the after sales service. They updated the firmware, and it was enough to fix it. They wrote that "the defect was not found" in their report.
- After 2 or 3 weeks, the phone stopped working at all: the screen is off, not responding to any buttons, including hidden power button and combos like power+volume up/down. Again, brought it to the service, with the same result: resetting firmware helped, but "the defect was not found". This time they did some "WRT test" (no one has any idea what it is exactly), which was fine too.
- Now, again, after 2 or 3 weeks, same happened - not working at all.
Phone condition is fine and I used it properly:
- It hasn't fallen once, didn't contact any water, was not affected by extreme temperatures, (electro-)magnetic fields, radiation, etc.
- Viruses are pretty much excluded: it had an antivirus installed, I only used apps from Google Play, and only the ones I trusted. I don't use any Wi-Fi spots outside of my home and office.
- The battery is fine.
Now, I just want my money back, but the only two documents I have on hand say that the device is perfectly fine, so the shop will refuse it. I want something to prove the defect is actually there. My questions are:
- What kind of problem can it be? If it's a hardware problem, why would firmware reset fix it? If it's a software problem, why would it even occur? My only idea is that it's a memory failure, but there was no indication of that when I did the firmware reset (I assume it should do at least basic tests).
- Is there a way to perform any conclusive tests by myself? I talked to managers in the service center, and they pretty much don't care. I have to chance to talk to engineers directly. I won't open the case or anything like that, and also now it's doesn't load at all, so the only options is to use some software on PC, with a USB cable. Is there any software for that?