Ever since I got my Droid Charge I've had the same problem - 4G freezes couple times a day. I have 3-4 bars, 4G logo but data " arrows" are gray, one of them blinks green and browser cant download anything. Airplane mode on/off is pretty much the only thing that helps.
I've been to two Vzw stores and they have no idea whats going on ( to tell the truth they're pretty useless :smileyhappy: ). Any ideas what could be causing this???