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You need to provide more details. What were you doing before this happened, were you updating iOS, were you running a particular program and then the phone crashed, were you trying to jailbreak the phone? What?

How long is for some time? 10 minutes? 3 days?

Hi

Go to iCloud make sure iCloud back up is on Then backup now over your wifi

Then go to settings down to reset Restore iPhone back to factory settings.

Set back up over your wifi when it asks if you want to use iCloud backup Say yes to get your apps and data back this will get rid of any bugs.

Cheers

Brian 🇬-1F1E7;