Yesterday my internet went down to i decided to reboot my bb curve 8520 - the reboot was starting then sticking at about 60%. This went on for 15 hours. tried battery pulls, removing sim etc. eventually i left it over night and this morning it was working. I darent turn it off and im scared that it will break the next time i reboot. Do you think this was a one off (and what would cause this) or should i send it away to be looked at?