Review of IOS 16.4 and 16.4.1 update in 12 mini

Hi,

After updating my phone to 16.4 some of the features are blocked because of overheating and resumes if the phone gets cool down. Sometime because of that my phone restarts automatically. Due to this there is some issue in cellular band, its not connecting to network after the restart, its just showing NO SERVICE. When the phone gets cool down, i need to reset all settings after that everything works fine for an hour then it repeats when the phone is hot. In apple service centre they say its hardware issue, if so it should not work permanently, how come it works when I reset all settings.

any of you facing the same in 12 mini?