After couple of days I got this lockscreen freeze and lost my sim again. Baked again and reflashed and installed cssu thumb and has been working fine. This time kept 10min in 200 celsius. Gonna report if/when gonna lose sim again. Hopefully never.

And I think it was a mistake to to play that much psycho pinball with the device using keyboard for control and let my kid play as well. With pinball you do not always press the keys with the lightest way. Maybe that is the reason for my device to to start having problems.