I've been having a lot of signal issues over the past week or so with my thunderbolt, where the signal bars will still show good signal, but no 4g, 3g, or even 1x. Its been happening to both my phone and my fiancees. Almost every time the signal drops out, I have to restart the phone to get it to recognize again. When it drops out, my widgets still show verizon wireless, and usually the weather widget will say no connection or timed out. We live in Las vegas, if that helps any with others experiencing the same problems.