4k TV Problem with Hopper w/ Sling?

Get a Hopper3. Not saying it'll fix it, however with all the features and quick accesses again, you may forget about it.
 
??? I'm pretty sure all 720 TVs will downrez a higher signal. Mine does.

Almost universally, yes, and I would not expect that to result in the display problems the OP describes in any case. If the TV could not handle 1080i/p, it should just result in a blank screen or maybe an out of range error message.
 

Update U236, dated 8/2/2017

Flex Pack channel 9605

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