Eseries / Communicators :: When Get An Incoming Calls, Phone Freezes?

I'm currently using E72-1 , V 031.023 Alot of times, when i get an incoming calls, my phone freezes once i click the accept button, it freezes for like 20 seconds, then either accepts the call, or hangs up. Also, when i dial a number using the keypad, there is a delay, like, it takes 1-3 seconds between each number i press to display on the screen. I tried soft resetting, hard resetting, both fixes the issue for the 1st few hours, then both issues happen agai