I had a customer call in and they said that their telephone was staticy and unable to use. I went out and after I replaced the phone it was perfect. They called next day and said it was the same problem, I went out and changed the port from 13 to 33. They called and said it did the same thing. I went out and put in on a new cable and modular cord. They called me today and said it still did it. The thing is every time I unplug the phone and plug it back in it works like a charm for a few hours. Any ideas what it could be? I did reassign the station 13 to port 33. Should I use another station number??

Any info would be great... The phone is a 6614 PGX.