I had the EXACT same issue today!! Constant data up and down. It drained my battery and got really hot too. I software "battery pulled", shut off and restarted multiple times and then it would start data use again. I did not install anything today so it wasnt a new program. One thing I noticed is that it doesnt show in battery info anything unusual but when I went into Task Manager it showed the music player using a lot of CPU. I thought maybe it was Motosync so I unchecked my computer... still did it. I stopped the music process and it still kept going. But then a couple hours later stopped! Now I guess I will see what others say. I thought maybe an update was being pushed. But nothing. Frustrating because I LOVE the phone otherwise.
Damn I turned off motocast today too thinking that was the problem. So far it hasn't done it today. We'll see.
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