Try wiping the cache partition of the phone and that should resolve the issue. Just search 'how to wipe cache partition S21 Plus' and you should find what you are looking for 😄. Hope this helps! 😁
15-08-202201:30 PM - last edited 15-08-202201:30 PM
Mine seems no different. I will say weather temperatures have risen recently however so any deviation in phones performance due to heat can most certainly be affected by ambient temperatures.