I can't seem to find out what this means. Every 6 months or so, my 7204 locks up. I can't even get to it via the console port and I must reboot to access it. I noticed this alarm in my logs.( ASSERT CRITICAL PO1/0 Threshold Cross Alarm - B3) I've looked on-line but can't pinpoint it's meaning. Looks like a flapping interface but might be something else. Please advise...
The chances of the router locking up due to these errors alone is pretty remote. It is more likely a hardware problem or software bug.
The most stable version is 12.4(17), but since you're running a T train release now you may need to upgrade to 12.4(15)T1 to keep the same features you have now.