been getting these "Unknown Stream error" msgs on some channels. There are a handful of sports channels that its been happening to. I've tested different apps on the same channels on the same provider and they do work, just not on the BuzzTV 5 app. I believe there are some updates that need to be done. I remember having the same issues back in the day with the XPL 3000 and 2000.

Please specify what model box you are running, and what firmware and software version you are running.  (And please don't say you have the "latest updates" 🙂

Also, is you sub MAC based, XC or M3U ?

Have you tried changing video players in the configuration menu ?   Have you tried to change the stream type if available in the configuration menu also.