D855 resets - G3 Q&A, Help & Troubleshooting

Hello.
Day before yesterday when I was charging my g3 he suddenly restarted, then after few seconds of lg logo screen turn black (deep sleep?). After removing battery (power button was not working) phone entered bootloop. After few hours of experimenting i find out that powering on lead either to bootloop (which end in deep sleep) or go straight into deep sleep, but when battery is removed for long enough (30+ min) phone sometimes turn on, but when I try to launch any app it freeze (sometimes i am able to send message, make call or go to settings) and after about three seconds resets what ends in bootloop or deep sleep. Also phone is not overheating, charge normally and i can enter download mode. Today i made factory reset (power+vol), phone turned on, I was able to get through configuration and reset.
Sorry for bad English, it's not my language.

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