Every since upgrading to OS 3.0 I've had a strange problem with my signal bars. I'll be using my phone (3G 16g) everything is peachy and I have full bars and 3g. I will then put my phone into sleep and when I click the home button or sleep key to look at the time or unlock, I see full bars for a moment then they disappear and I'll have none. This happens constantly and the bars will slowly come back one by one over a period of time. I've tried the "Airplane mode" trick and it helps sometimes. Anyone else having this problem? It makes phone calls frustrating because I wont have full signal to talk.