In the last week, we have been having major issues with our video playback. It will stutter a lot, and freeze several times over.
What browser are you using? I can't get Channels to playback properly in Firefox but I can get it to play back in Chrome with little to no issues.
For me (using Chrome) the playback of OTA channels works great but the HDHomerun Premium channels continually freeze. The only way I can play back the Premium channels is using the apps (IOS, apple tv and fire tv). Wish they would fix this or make a native Windows app...