Same here - that channel has started to glitch out recently forcing me to switch to HD instead. I get frequent freezing for a few seconds and sound cutting out here and there. It was fine before and this just started recently.
I'm having this issue on sn4k channel 507 watching the leafs game. Anyone else still having this? It just stutters and the audio skips every so often during the game.. not even just the game but commercials too.