About once a week I'm having trouble getting my phone to hang up. I have only had the phone for about 5 months but sometimes it takes up to 2 days for me to be able to make an outgoing call. It only happens when I make a call and the other person doesn't answer. After I hang up (or try to) I can only receive calls but the phone won't allow me to make outgoing calls. I've tried turning it off and back on (several times)...the only thing that seems to work is deleting an application and forcing the phone to reboot. Has anyone experieced this before...any advice or assistance would really be appreciated.