Everything Looks Like Shot on Video

Check format/resolution settings?

That's why I hate video. Plug and play with the remote. You probably have to set your cable box to your TV's native resolution.

It is called "Soap Opera Effect" and is caused by higher frame rate. Films are mostly made using "magical" 24 frames/s. I can set my Samsung LED TV to max frame rate of 240Hz and get the same effect. It is possible that when reconnecting you used different HDMI input (that had high frame rate by default) . My TV has separate settings for each input and each mode.

Delete all the channels and let your box refind them