TV turn on and off on one channel only

[timberstx]

I have a 40" Sony XBR4, purchased early 2008, and no issues yet. Today I was scanning channels and stopped at 17.3 (portland oregon) and the tv turned off. Then on, then off, and kept doing that with out changing the time pattern. It would start to turn on, then turn off before I saw a picture. About 4 cycles every 30 seconds.
I finally unplugged the over the air antenna, and the cycle stopped and the tv turn on, and stayed on. I plugged the antenna in, and was back to the turning on and off. The only way to stop this was unplug the antenna, then turn the channel.
The TV now works fine on all channels except 17.3, where the problem will occur again. Channel 17.2 does not cause problems.
Channel 17.3 is a mini tv guide type channel. I have deleted this channel from the program but does anyone know why it does this?