Unstoppable Rebooting IOS13.3

Well, if it is a software glitch, generally a forced restart of the device solves the issue.

Shouldn't be this case, it might be also a hardware (digitizer?) problem. But we can't diagnose those things remotely. That's why I suggested an inspection.

Or, it could be also a "wrong" iOS update (I mean that something could have gone wrong during the update process). In such a situation, you can try to install a fresh copy of IOS, creating a full backup of the iPhone, restoring it to factory settings, and, in the end, setting it up as new.

These are the steps for that procedure:--> Restore your iPhone, iPad, or iPod to factory settings - Apple Support

When done, restore data from your previously made backup.

BUT, the problem is that if it doesn't stop restarting by itself, you won't be able to perform ALL the steps suggested.

Regards and best of luck

Giulio

Try a forced restart of that iPhone:--> Force restart iPhone – Apple Support

If you get no improvements, have that device inspected at an Apple Store or Authorized Service Provider.

Regards

Giulio

My pleasure, Gus.

All the best,

Giulio