My problem is similiar. When I stream my 500 directly to my Fire TV (same network just located in another room) the stream stutters and stalls out anywhere from 3 - 8 seconds. There's nothing like watching a show and only hearing 1 of every 2 -3 words said .
I can stream from the 500 to my LG mobile phone and cast to my Roku XS with no stutter or stalling problem. It doesn't matter if both are on my home network or if I'm streaming through my mobile phone. It seem that the problem is in the Fire TV Slingplayer app. I absolutely hate having to use the Fire TV Slingplayer app.
I'm still having this issue a month later. Is no one else having issues in Fire TV?
Original Post: Remote watching connected M1 to high speed network via iPhone/Roku and Fire TV (also trying Fire Stick) Getting dropped constantly using any Fire devices or Roku. Maybe every 2-5 minutes. Lots of buffering, freezing, lock-up, bad video quality, constantly asking to change quality. Have to reconnect every time to get it going again. However, when I watch via the app on iPad or iPhone (without slinging), I don't experience the dropping AND video quality and buffering are much improved. Anyone know how to stay connected through Roku or Fire TV? I'd rather use Fire TV so would like a solution for it. This is the whole reason I have Slingbox and Fire TV. Thanks!