YouTube VR movies stop working for me.

Tybomb

Anyone know why this is happening. I'll be surfing YouTube for VR movies to check out on my pc. I use Firefox and rotate the view with my mouse just to see if it's something I might want to try on my oculus go.  If I do I'll try and download it using a YouTube downloader.  
But I'm finding that some videos I checked out and downloaded 2 days ago will now only show as 2d when I go back to the YouTube channel.  Even if I paste the link into a YouTube downloader site I'll still just get 2d non spherical options even though it worked before.  I tried using Opera and still just 2d.  If I go to the video on my phone it will  be be though.
So basically SOME 3dvr videos on YouTube are working one day and then not the next.

What could be causing this?  I can't think of any good reason unless it's a hardware issue.