Thaanks!
So, iv tried everything: remove SD card, start in safe mode...and SOD persists.
What I realized is that since I changed the chip, sod only occurs when using the phone for a long time ( one to two hours continuously)
Before replacing sim card always ocurred, no matter what or when. While i was using my mom's sim card never ocurred. And no, the battery looks ok, normal, anything diffent.