I have a fire HD 8, 6th generation. I have several songs from Amazon Music downloaded on my device. Up until about last November, I would shuffle my offline music in my car and it worked great.. Now,the first song will play,then I get an error for the next one telling me Wi-Fi is required. I have cleared my cache and made sure the device is up to date. I have talked to Amazon twice. The first time, I had to deregister my device and reregister it. That worked for one day. The second time they told me it was a known issue with fire tablets, but I don't see any other threads about it. I'm very frustrated with the whole thing. Is anyone else having this problem since is supposed to be a known issue?
Are you still having this problem? I may have found a fix as I can now download and listen to my "Downloaded" files without an internet connection.
Per Amazon's suggestion on the forum, I uninstalled the app, restarted phone, and reinstalled Amazon Music only to find out I couldn't actually "download" songs. It said they downloaded but the folders were empty (only a few kb) so what it actually was doing was pretending to download and then streaming the song every time I tried listening to the "downloaded" version. That is why I kept getting the message of internet failure or error 180.
Unfortunately I lost all my downloaded songs with the uninstall and will have to manually download each one again with the backup list I made, but perhaps you can save yours:
1) See if your Settings has the option to "redownload unavailable songs to the offline library"
This was the last step I tried and ever since I have been able to download music to both the
internal and external locations
2) If you don't see that option, try renaming the folder where your download files are stored