youtube resolution hobbling

[Eidolon]

This is an odd one. Google Digital code redeems that play via youtube used to play fine in their native resolutions.
But now, im finding that the vast majority of my purchased contents are now playing in limited resolutions.
The Lionsgate and 88Films titles still play fine at 1080 with no problems, but all other company films are playing at 720p on the playstation, or 480 on the Firestick.
Using the 'stats for nerds' disply, it shows that ther eis no good reason why this stuff isn't playing in 1080p still. Bandwith is more than adequate, other 1080p Youtube videos still play fine (as does 1080p in other apps), and the videos are still on youtube in 1080.
So why are they only playing in lower resolutions? Based on the differences between the ps4 and Firestick, this is something that's been done delibarely, someone somwhere has decided to limit res depending on the platform that's playing them, despite there being no problem with said devices being able to play in full HD.
I have checked with friends, and they've all found the same problem.
It's an extremely annoying problem that doesn't seem to have a resolution.