Force restart the iPhone
Update iOS to the latest version
Turn off Low Power Mode
Disable Background App Refresh
Close recently used apps
Check for overheating and let the phone cool down
Remove any screen protector or case causing pressure
Reduce Motion in Accessibility settings
Turn off ProMotion-related display issues by toggling Always On Display off and on
Reset all settings
Free up storage space
Check battery health
Update all apps
Delete and reinstall problematic apps
Reset network settings
Restore the iPhone using Finder or iTunes
Contact Apple Support or visit an Apple Store