Sony Xperia Z3 random restarts then began boot looping - Android Q&A, Help & Troubleshooting

Hello,
So as the title reads, my xperia z3 has been malfunctioning. About two days ago, it began restarting randomly. Today, it is stuck in a boot loop. I tried to repair the software with Sony's xperia companion, but that process failed. As of now, the phone will reach the welcome screen, but then restart.
Please help.

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[Q] ST15i stuck on logo

I have Sony Ericsson ST15i which was running stock Android 2.3.4. and never has been modified. I woke up during the night because the phone was vibrating. I don't know what happened. The phone was in constant boot loop and was vibrating. I removed battery and reinserted. Still boot loop.
After searching the web, I found out this site and after some reading, used Flashtools to flash stock firmware Xperia Mini (ST15i)_4.0.2.A.0.42_CE in Flashmode. Restarted the phone. After the phone powered on and 'Sony Ericsson' appeared on screen, the phone restarted and got stuck on animated logo. I flashed again now with ST15i_4.0.2.A.0.62__1251-0020_. Still the same behaviour: stuck on logo after restarting. Then flashed again with (ST15i)_4.0.2.A.0.42_CE. Still stuck after restarting.
Does anyone know how to repair the phone? Can it be hardware-related damage?
After being stuck for about 24 hours, the phone turned off itself. I turned it on and is still stuck on animated logo.
The battery drained completely and I turned on the phone after recharging. After several boot loops, the phone finally got stuck on animated logo.
SE_2004 said:
The battery drained completely and I turned on the phone after recharging. After several boot loops, the phone finally got stuck on animated logo.
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try flash a ICS release. also put out the SD. if still this behaviour, its surely HW dmg.
here link for guide & ics ftf file dowload
http://talk.sonymobile.com/t5/Andro...y-Bean-ICS-Ice-Cream-Sandwich-and/td-p/154389
I tried your suggestion, but that did not help.

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Hello, my Sony Xperia Z2 has turned off, so I tried to power it on. Xperia stays on Sony logo for about 5 sec and restart. I repaired it with Sony PC Companion with success, but still bootloop. So I flashed new ROM via Flashtoll with success and still bootloop. Can you help me?
Sorry for my bad english
Did you wipe data?
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