Nokia Nseries :: 808 Reboots Itself Randomly?

My 808 reboots itself randomly and without any user input. This happens every now and then. Sometimes goes a couple of days without problem, sometimes it restarts couple of times a day. This mornig, for example, I was using Maps and Public Transport apps to find my way to work. When I got to office, I put the phone avay for a few minutes and during that time it had restared itself, while being in my pocket and screen lock on. All I managed to see was the white dot animation, which is shown at early stages of the startup, followed by home screen icons loading one by one.Device had and still has no third party apps or background services running. In fact, only apps I had used recently were offical release versions made by Nokia and downloaded from Nokia Store.Nokia should really get their act together and improve software quality of the both firmware and utilites running on top of it.