New Random reboots mi 11 ultra XEU stable

[Cotof]

Hi. Have a very strange issue with my mi 11 ultra. Since I installed weekly hey I have a random reboots, that can happen any time. For example at night, or when I talking with smb (calling). Also google pay security check often break. I wipe google services data and reinstall pay and thats helped. Im doing it once a week. I tried clean falshes of weekly rom many times, but the problem is still appear. Week ago I tried installing official CN rom via MiFlash, I clean flashed CN 13.0.5, than clean flashed XEU stable 13.0.5 but the problem is still there. Random reboot, app crashes and google pay dont pass security test. Sorry for my bad english. What should I do?