iphone5s keeps locking up every few seconds
how to keep iphone 5s open for several minutes
iPhone 5s, iOS 12
how to keep iphone 5s open for several minutes
iPhone 5s, iOS 12
Check: Settings>Display&Brightness>Autolock... and choose the time there.
If it doesn't work, restart your iphone and try again.
If the issue still persists, your iphone could have a hardware problem. Have it inspected at an Apple store or Authorized Service Provider: Apple – Location Selector
Regards
Giulio
iphone5s keeps locking up every few seconds