I730 phone module fatal Error

I had purchased a Samsung i730 back in Nov 06 off of ebay. The phone and pocket PC had worked great until recently. I get a "Phone Fatal Error" Message on the phone. The phone will work momentarily and then cut out. I can reset the PC and then the phone will work shortly again then cut out. Everything else appears to works great. Has anyone else appeared to have this problem, if so, how can I get it resolved? thanks