"Video unavailable there is a problem loading this video"

I can watch Apple+ perfectly well on a Windows Laptop but for the last few days I have been getting this message when I try to watch shows via my TV streaming device (Firestick), the recap of previous episodes play but when it should start to play the next episode... it stops and shows the message. I reset the Apple TV app and logged in as normal...same 'problem' happens again. Tried the Video Troubleshooting and it passed the tests. I watch via a 4K Firestick. Disney+; Prime; Paramount+; YouTube; Netflix all play videos without a problem, I went on a couple of other forum sites and other folk experience the same 'problem' with videos aborting and not continuing to play. On the forum a suggestion is to disable the analytical reporting on the app...didn't work for me. 'For All Mankind' would not play episode 4, so I skipped to the next episode and all was 'well' until the app stopped working properly altogether. I don't understand how videos work up to a point before aborting. Very frustrating indeed. Tried Apple support but they were at a loss as to how to 'fix' the problem. A conspiracy theorist might tell me it is Apple's way to try to get you to upgrade from an Amazon Firestick to an expensive AppleTV 'box'. I think I shall have to start pairing my Windows laptop to my TV and watch that way from now on...hardly a good 'fix'. Anybody got any other ideas please and thank you.