We have a 2620 with a WIC1T attached to a 2mb line. Is there any way of calculating how may PCs, printers etc can be attached before there is a performance degradation?
This may sound a bit simplistic but have you tried changing the timeout parameter on your chat script from 30 to 60. I had this problem on a 2620 and solved it by increasing the timeout. Give it a try - can't hurt.