iPhone 5 keeps restarting
So this morning, my phone has started to act weird. Mail won't open properly, it opens and then force quits.
Now every few minutes my handset is restarting itself. I've not installed any new apps as of late and this has only been happening since this morning. I've also noticed that my phone will come up with 'No SIM Installed'. It's done this a couple of times since yesterday morning.
Any ideas anyone? Thanks!
iPhone 5, iOS 6