I have a 2811 router with a T3 module. It was running great until two and a half weeks ago, when it started taking CRC errors on the input side of the T3. Then it really got strange. The router started turning itself off for various lengths of time and turning back on. Thinking the router was going bad, I RMA'd it and the T3 card and replaced it. All was good for a couple of days, then the same thing started up again. I RMA'd the second router. When I went to install the third router, I couldn't get power to it. It was plugged into a power stripon our UPS with a Cisco switch, which did not have any problem. I moved the plug to a different circuit on the UPS and finally got the router working. Again, it was fine for 2-3 days, and then it started the power down/power up thing. I even replaced the power cord, to be safe. Anyone here of something like this? Could a malformed packet across the T3 cause this? The router's T3 comes off a Fluke Network probe. I tried to eliminate this device, but the router wouldn't talk to the T3 without the probe being in-line.