I have seen a thread on this before but cant find it now.
Are people still experiencing this? I heard it may be Facebook causing it. I dont have an App for facebook but use it through the people hub.
Just now the phone wasn't even being used on standby mode on my desk. On my computer I went to Facebook looked at my notifications to clear them down, within 2-3 seconds my phone vibrated and rebooted.
It doesn't seem to be that much of an issue as it only has reboot when I have been messing around with the phone or like now when Im not using it, but still needs to be addressed I feel.