I've got a '16 19H as well. And just this past weekend, I noticed that the water pump interfered with the TV, also. We were watching over the air broadcasting when I noticed it. But, just like you, if I turned it off and on, it worked fine. I was figuring that it could be bad connections causing RFI interference in the broadcast. But, if that was the case, once the pump shut off, the interference should stop, too. The picture remained pixelated until I "rebooted" the system.
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2016 Jay Feather X19H
1999 Chevy Silverado 1500 4x4