I have a 3GS running 4.0.1, jailbroken a la jailbreakme.com. During a call, it likes to become unresponsive. The lock button won't do anything, tapping the status bar to return to the call won't budge... Basically, whatever calls the Phone app to the screen doesn't work, besides hitting the Phone icon. Once I hang up, everything goes back to normal. Anyone else having this issue, or know of a fix?