Hello, sry for my late reply. I'm now checking back to see whether this issue has been solved already by Sony. I'm quite surprised that it's still remain unsolved. It seems Sony doesn't care about it anymore; the issue still exists in Z5. (Wake up Sony!) Update for my device: I marked this topic as solution because at first my phone was just restarting constantly and optmizing apps. After repairing it with PC Companion as recommended, it worked. Marked solution. But after a few days, it was suddenly completely dead: no power detection, no charging, try all button pressing methods but to no avail. My phone is now more related to this topic: https://talk.sonymobile.com/t5/Xperia-Z3-Compact/Sudden-Death-of-Sony-xperia-Z3-Compact/td-p/877345/page/43 My Sony phone is resting in peace for almost a year now. Now using ASUS Zenfone 2 and very happy with it.
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Officially updated to Android Lollipop 5.1.1 last week. Been in good condition until I restarted the phone today. Now, whenever it's powered up, it optimizes apps, and restarts after optimizing is finished, without reaching lockscreen. I leave it like that for 3 hours hoping it will solve itself, but it just keeps on restarting and optimizing repeatedly. Have to switch off by the button beside the sim card slot. Tried to fix it with SonyPC Companion but it's not detected when connected to laptop. Your help is truly appreciated.
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