Default [Q] Manta MS5001 mtk 6589 quad core 1.2ghz

Hi guys! My phone has stopped working. When I turn it on, phone starts booting system and restarts, trying to boot again and restart... again and again and again... Sometimes when I've some luck it turns on, works while, sometimes more (last time few hours). But finally restart again and back to restarting and being unable to run system I've formated my phone, installed stock rom, wiped everything, got clear phone... but it didn't help. I've no idea what's going on. I hope you guys have some ideas! I've new account here and i can't paste link here how it's look like.