Purchased a S21 Ultra.
1) Phone overheats during calls with ambient Temps only at 82 deg. Cleared cache and restarted. Did not resolve issue.
2) Image quality from main camera in auto mode is extremely grainy. Gets way worse when set to 108mp.
3) Pixel jumping occurs randomly. Screen vibrates continuously until I shut down phone.
Warning to everyone, Samsung customer service has been extremely poor. Spent 3 hours on the phone with them, to only have them tell me that there is nothing they can do to help. Also, never received a call back when I requested to speak to a manager about all my issues.
Hope everyone else is having better luck with the S21. Sadly, this will be my last purchase through Samsung.