Mine did it for the first time yesterday. I had to power it down a couple times before it finally regained signal. Now I'm also having an issue with it randomly dropping calls. Two days in a row now I've had the call disconnected screen several times for no apparent reason. I used speakerphone this morning while driving to work so I could keep an eye on the screen and sure enough it happened 3 times. This really has me considering the Hero or going back to a BlackBerry.
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