Android app on Fire Stick hangs/slow performance after time

[warrencalvert 16]

Running Emby for Android 3.5.34 on a Fire Stick.

When first launched, Emby works fine.  However when I leave Emby for some time (either paused or just not playing anything) and come back to it, Emby almost stops responding.  A cursor movement can take 10 seconds or longer to respond.  Restarting Emby fixes it but it can take up to a couple of minutes to actually get Emby restarted.

I've reset the Fire Stick to factory defaults and installed only Emby Android.

The only setting I have changed is to disable Direct Stream

Any suggestions what I can do to fix this?
Thanks,
Warren.