Buffering

go on downloader in the url type in fast.com check speed to the stick.
do films or series buffer, or is it just live tv ?
try doing the usual maintenence on the firestick. clear App cache you use.
try using a different Player in your App.

If its only on some certain channels it might not even be your problem. Speak to your provider ask them to check the channel see if its the same.
Just done that and getting 50mbps
 
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