Table tuner (shield) sluggish/motion off

I’ve been using my tuner on my shield for a couple weeks now. It’s on and off but the motion is off frequently making it almost unbearable to watch. If I plug my antenna directly to my tv this doesn’t happen so it doesn’t seem to be any signal or antenna issue. I’m wondering if somehow it’s the simultaneous recording while tv is on that’s causing an issue… There doesn’t seem to be a way to turn that off.

Any ideas? Not using an external HDD, just the built in shield HDD.