If there was a problem with the FoxSports app/channel, everyone streaming the game would have issues...everyone.
There are multiple things that can cause issues that have nothing to do with the source, FoxSports. To mention a couple it could be bandwidth issues, internet provider throttling, or issues with your device.
It's a shame that everyone can't enjoy the games but I don't know of any answers.
BTW something that I have noticed during the game and even on replays: quite often the video and sound are not in sync, they are noticeably out of sync.