I have an iPhone 4 on 4.0 that is jailbroken. I have a few jailbreak apps installed (Lockinfo, MyWi, BiteSMS). What I'm noticing is that my signal strength periodically drops to practically nothing (1 bar), and then over the course of the next 20 seconds or so ramps up to full signal strength. Now, I recently changed work locations such that I'm further from a tower. Even my 3G had 4/5 bars here instead of the steady 5 where I had been working (and recall these are the pre-4.0.1 bars). I've noticed significantly reduced battery life, but the fluctuating signal strength is troublesome. Is CommCenter in some kind of reboot loop? Any other ideas on what may be happening? Note that this can occur in my hand, sitting on the table untouched, or even as soon as I take it out of my pocket. It does not seem to be related to the antenna issue.