Found a Solution
Requested from Apple for service, they sent to Best Buy, they couldn’t do and I had to go to Apple store. They said everything was fine. Told them random automatic restarts, freeze when screen shots, lagging for no reason. They did “diagnostics” in 2 steps, first software and second was hardware. Both came out good, of course, why would they own it. Guy advised me to go complete clean erase, when fresh setting up your iPhone, do not opt for any backup, meaning you start fresh. However, if you backed up youth photos, messages, contacts and other essential stuff, when you login, they should all come back. Only issue is to reinstall every old app manually. Now my 12 pro max doesn’t lag, no restarts or screenshot freeze. So the problem was to restore a backup from the old phone.