Hello, for 2 weeks I use an Amazon Fire TV that is connected to a Denon AVR-3400X amp. my problem is that every time I turn on my Fire TV I have to restart it because I only have a small screen on the top left of my TV.
I have been having the same issue recently, mine is going through a sony STR-DN840 receiver and I have the same issue. I have found, that running the firetv through our xbox one, then through the stereo does not produce this issue. I assume it is with how the stereo is interpreting the signal, I just don't know how to correct it yet though. Running the fire tv through the xbox one works well, although it can often result in its own issues, video will freeze for several seconds every minute or so, making it very frustrating when trying to watch a program.