Mine is a Genesis 2.0, but they probably use the same tuners.
I think VinceU might be onto something. You mention the antenna is fine, which I assume means that you have it in the upright position. Did you also pull the unit to check for loose connections? At least that would be one of the first things I would check.
Assuming that isn't working, you can give Bob Fields a call or shoot him an email. He's also a member here if you want to PM him instead.
574-343-1165 - Elkhart Office