This also happened on my Droid, so I'm not sure what the deal is. When I'm in a call sometimes my phone will black in and out, if I tilt the phone it will kick on for a half second and then kick off. The phone is still working and I'm still in the call, but I'm unable to do anything on the phone. Alternatively, if the phone does stay on and I try to touch a keypad the screen goes black again. Also, sometimes I won't be able to touch the number pad. The only way to get the keypad to work is if I drag the top down, click the little phone icon, and then the keypad again and it will work. It's driving me CRAZY. Lastly, I have my phone with the pattern unlock because I like to know only I can open it. However, I don't want the timeout delay to long and drain my battery, but if I need to touch anything my phone needs to be unlocked during calls. Is there an app that keeps your phone on JUST during phone calls? Thanks for the help!