Strange iPhone Reboots

Over the last couple of weeks, my iPhone 5S has been rebooting itself during the night. Once (last Saturday) it got stuck in a reboot loop on the Apple logo screen. Strangely, it seemed to be emitting some kind of tone every time it restarted… maybe that was my woken-at-3am brain imagining things, but I’m sure it also made a noise in the early hours of this morning when it rebooted.

The most annoying thing about this, is that it’s only happening at night, while I’m asleep. I know it’s happening because my lock screen tells me so, and I can’t use TouchID to unlock the phone. That, and the fact the display flashing up the stark white loading screen sometimes wakes me up. Throughout the day, everything appears fine. It’s really quite bizarre.

I’d reset the phone to factory settings, but there are a couple of security-related apps installed which would be a massive PITA to have to de-authorise and set up again.

Has anyone else experienced this?

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