I have Hopper with 2 Joey's (coax connection from Hopper to the Joey's, not wireless). While streaming Netflix on the main Hopper and TV, I will have intermittent pixelation if I'm watching satellite TV on one of the JOEY TV's. The Netflix stream has no issues when this happens.
Weather is not an issue, the dish is completely clear of snow, signal shows solid. We have 10Mbps internet via fiber optic, and speed test shows we are getting it.
This almost seems like there's a bandwidth issue with the Hopper unit? Any suggestions on things to look at?