i thought i had a problem with my new GT ! it was letting out a crazy sound about every 3 min? i thought mabe it was the batt,so i changed it to the alkaline pack and same thing .out of no where it would blurp,zwank,go from hi to low and low to high.come to find out it was my Nextel cell phone in my right pocket.ever so often it would update and when it did my GT would go crazy! who would have thunk that.LOL!