I HAVE A BLACKBERRY CURVE...ABOUT A YEAR OR SO OLD....
IT'S BEEN JUST TURNING ITSELF OFF ON IT OWN OR "REBOOTING" IF YOU WILL...IT GOES OFF FOR ABOUT A MINUTE OR TWO AND THEN COMES BACK ON AND "VERIFIES SECURITY" AND USUALLY IS FINE AGAIN....TIL THE NEXT TIME IT DECIDES TO DO THIS....
ANYONE...