3310 contact service

hi
i have one 3310 that comes to me with contact service, i saw the imei corrupt and when i did the test with eprom tools, it told me "mcu eprom interface test failed" and "eprom tune checksum test failed"
the first data, seems to me that can be some broken ball in the epron ic or something similar and the second data is because the imei is corrupt.
anyway, i flashed the phone with an upper version and the phone works with two problems that i notice, when i do a call it take a long time till i listen the tone of the call, but i can do the call, the other problem is that most times, after i dial the number, when i press the call key, the phone power off or reboot.
after this, i rehot the ccont and the rom and flash ic's and now the phone is dead.
can anybody tell me anything about this?
thanks