Interesting, I too have noticed a lowering of signal strength. Mine started about a week and a half ago, and I can't pinpoint it to anything I have done (I am t-mobile on the central coast of California). Initially I was stumped. It seems to have gotten better (again), but I could not figure out what was causing the issue. I did allow auto-disconnect to use 3g where available, and that seemed to get things going again. Perhaps the service providers were doing some work. Never had 3g at the house before, now it is full strength.