Comcast on Demand issues

I have a XL4 in the living room and a mini in my bedroom and I cannot get on demand for Comcast on either one. I can use Amazon prime with no issues. I have another regular TiVo HD DVR that my mom uses and the Comcast on demand works on that DVR. I can get into on demand, select something to play, then it only plays a few seconds and then freezes or blacks out but the timer on the progress bar keeps going.

I rebooted the TiVo and removed the cable card…

Any ideas?
Thanks