I did merge another post on this topic with this one so we could keep things organized. That may be why you're seeing a closed topic.
We believe that this is an issue w/ the Amazon Fire TV 3 itself, as users of other apps are reporting similar issues.
Since we're in Canada we had to wait for international shipping to get our AFTV3 so it still hasn't arrived at HQ. Once it does we'll do some thorough testing and see if we can push a fix to work around the issues, or work with Amazon to find a solution. (Or both!)