I have a 3750 switch that is been used as a distribution switch. I have a number of vlans on the switch.This switch is connected to a catalyst 6500 switch through ospf. This connection has been in place for about 3 years now without a problem. Lately, the interface on the 3750 (gigabit port,L3) has been giving me sleepless nights. everyday,the port shuts down and i either have to restart the switch or remove the fiber cable and re-insert it before the link comes up. I am at wits-end. Can somebody tell me what could be the problem and suggest how I can get it fix.