iPhone malfunctioning. Magnetic mounts an issue? Why is there no warning from Apple?

Do magnetic car mounts cause issues with iPhone 12? Phone has various problems where camera, speaker, airdrop, pairing are malfunction and glitching. Phone calls also drop frequently, screen flickers and the phone gets VERY hot. Phone has many issues but Apple cannot identify a problem. Claiming it could be magnet mount. Is there any warning that these mounts can cause this varying issues? I see problem with camera but what about the other areas causing issues?