iPhon XS Max getting hot and not performing well
my Max will get hot doing simple things and the screen will dim and it gets hot while
just charging
iPhone XS
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Hello,
Start here: Keeping iPhone, iPad, and iPod touch within acceptable operating temperatures
However, if it is getting hot while charging, and not merely warm, check the charging port for lint or other debris:
How to clean your iPhone's charging port
If no help, the phone should not be used and should be checked immediately: Find Locations
Good luck.