See this article and update your devices to iOS 11.2:
If your iPhone, iPad, or iPod touch unexpectedly restarts - Apple Support
Regards
Giulio
See this article and update your devices to iOS 11.2:
If your iPhone, iPad, or iPod touch unexpectedly restarts - Apple Support
Regards
Giulio
See this article and update your devices to iOS 11.2:
If your iPhone, iPad, or iPod touch unexpectedly restarts - Apple Support
Regards
Giulio
Hi
Go to settings down to display & brightness check auto lock time.
Also go to i books download ios 11 user guide &iPhone 8 guide both are free.
Cheers
Brian 🇬-1F1E7;
My iPhone keeps closing