A few weeks ago I started encountering problems with my GS2 with Jelly Bean, but the problem only occurs when I'm at home or close to home. The 3g and 4g indicators disappear, and the signal strength meter bounces all over the place from not available to full strength. I called Sprint a couple of times and they said that one of the five towers I connect to in my home ZIP code was operating at 87% (13% of calls being dropped), but that doesn't explain the problems I'm having. I have also updated my PRL and profile multiple times, and I've even reset the phone completely. My sons both have iPhones on Sprint, and they haven't seen any of these problems. Finally, when I go to work or otherwise leave my home ZIP code, then the phone works perfectly fine. Any ideas?