Weird and somewhat funny Tivo message

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So I forgot to record a program and so at work I went online and scheduled
it. No problem I thought, it went smoothly as on other occasions, but when I got home there was a message stating the program was not recorded because the DVR could not tune 0 (as in zero). No big deal I rented the program from iTunes. What is weird is that the program was channel 11-1 and I use OTA reception, so no cable cards or tuning adaptors could do anything to foul up the process. This was with a Tivo HD for the record.
What I'm wondering is why the system would even think it has to tune zero at all. Probably some fluky one time error was the system.
Anyone else ever see anything similar?