I have jolting pain in my wrist. It isn't all the time, it comes and goes and is just as quick as a quick jolt and the pain is gone for anywhere from 1 minute to a few hours until the next jolt comes. It isn't brought on by anything. My arm could be simply hanging at my side, I could be laying down, or I could be using it. When the jolt comes my wrist gets really weak for that small instant, but just as soon as the jolt comes and goes, so does my strength. What could this be??