I seem to have a very unusual problem. I've got a 7206VXR with an NPE-400 and four PA-MC-2T3+ port adapters. It's running 12.2(18)S12.
The symptom I'm seeing is that a configured, but inactive, T1 interface on a T3 will be in an up/down state and apparently begin taking "ghost" traffic inbound (based on the interface stats). That's odd enough, but that same traffic seems to be switched out another T1 interface on a different T3. It causes all manner of problems for the live customer on the destination interface. Putting the offending up/down T1 interface into an administratively down state ceases the "ghost" traffic and corrects the problem.
I've seen this happen three times on this chassis in the last month. The router was reloaded between each instance and a suspect PA was replaced between the second and third instance. Also, it's not always the same interface or even PA slot causing the issue.
I've checked the bug toolkit and the release notes for 12.2S, but came up empty handed. Has anyone seen anything like this before?