irratic signal on Nokia 3200

Hi everyone,

I have a nokia 3200 in for repair with erratic signal problem.

I have checked all the usual circuit board connections, antenna, etc.. but to no success. There is no evidence of liquid or physical damage or anything like that.

When the unit is on test it will gradually raise and lower the signal strength on its own and eventually 4 minutes later come up saying select network and it re-logs on to the network with almost zero signal strength and slowly comes back to normal.

I am starting to think this is a software issue more than hardware.

ANY IDEAS ANYBODY?