I have been using the 2160a for a few years now. It has been very reliable and I love it and use it a lot. I have Comcast limited basic and I don't have a cable box. I hook the incoming cable line to my 2160a and then use an HDMI cable to connect from the Mag to my TV. Recently, I have been having the following problem. When my Mag is off, the picture reception on my TV is good on all channels, using the tuner in my TV. However, when the Mag is on, the reception on my TV [using the TV tuner] is very poor on 4 channels . The picture breaks up to the point to where it is unwatchable. When I turn the mag off, the picture returns to good quality. The problem channels are: Channel 7.1 [ABC], and the 3 PBS channels -- 56.1, 56.2, 56.3. All other channels have good reception, with no signs of breakup. I have not made any changes that could account for this problem.
This problem does not allow me to watch programs on channel 7, 56..., while recording programs on other channels with the Mag.
Anybody got any ideas on what is going on here, and how to fix it?
I'd try a Soft Reset first...
then, if no change, a channel rescan with Auto Channel Preset > Cable (Analog/Digital)?