So I was just using my omnia 7 today (specifically the words by post app) and the phone spontaneously rebooted. The device was stationary on the table, nothing of note that could have caused it. It has never ever rebooted in the entire 12 months I've owned it.
At first I thought nothing of it but not 2 minutes later the exact same thing happened on my wife's htc mozart (she was not even in an app so I've ruled that out). Again, she was not moving it, its never happened on her device before.
Any ideas on what could've caused it? Can phones be rebooted over the network?
My HTC Mozart would reboot anytime I had Location turned on. At first it would reboot after 10-15 minutes and then heat up a bit. I phoned HTC, and they picked it up and returned it within 3 days and replaced the PCM board. Hasn't restarted since and I've never had a problem with the Lumia 800. If you find that it reboots often, check the Location status or if 3G is at that time and if the phone gets warmer than usual.