Dang. That usually fixes things.
8.31.2 was released in late March, so it has been on the Amazon app store for almost a month. I’ve some remote users with FireSticks and they haven’t reported any problems (I’m not doubting your problems, just haven’t heard of similar with 8.31.2).
You could try rolling back to a prior version, but I do not know if that will help.
You might try 8.30.2. Many Nvidia Shield users rolled back to it due to some Shield specific issues. It appears to be a solid release.
The old versions are available in the Announcement Thread. Use the Amazon Fire OS Devices version.
See this post and the one immediately after for info on sideloading.
FYI: You’ll notice in the announcement thread the current release is 9.0.6. Amazon app approval time is sometimes quite long. That is why the Amazon store version lags the Google store version by several releases.
