Interface Hangs with no Apparent Reason

Hello,

I have a T1 connection, both ends are using Cisco T1-WIC and using
vanilla config on the interface. No link flaps, no log entries...
interface stays up. For no obvious reason, the interface hang and no
more tcp connectivity on both end, unless I do a shutdown / no shutdown
on either of the router's serial interface.

Could it be a bad WIC? Patch cord is about 5ft so I don't think it's a
distance issue.

Please, any input would be appreciated.

Regards,
Bitoy

 

Or the interface is becoming wedged due to an IOS bug.

Capture the output of show tech BEFORE you do a shut/noshut so that
you can open a case with the Cisco TAC should that be necessary.

You could also try upgrading the IOS version to see if the problem
clears

 

Were you referring to this IOS bug? Thanks!
http://www.cisco.com/warp/public/707/cisco-sa-20030717-blocked.shtml

 

I was not referring to any specific IOS bug.

You should consider upgrading to the latest release of the IOS train
currently in use on the box in question.