Hardware error I have not seen - "Unknown Frequency"

I've got a 2951 Router that we just received, and when I went to load up a config file, I am seeing the message "Unknown Frequency" about every 10-15 on the console. It does not register in the log, in fact it doesn't even have a facility code with it. Just the message. I can't seem to find anything else on it, wondering if anyone else has seen this. The router has 15.2(4)M6a IOS, 512MB DRAM, licensed for Data and Security, some 4 port serial HWIC cards, and a SM-D-ES3G-48-P module in slot 2. I've had no other issues with this design in other routers.

Thanks in advance.

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