It's probably not an issue with YT, even 4k YT in the noob Internet Browser has the same issue. Actually i figured out what the issue is. And also found a bloody workaround, so, SAMSUNG, go and fix that Issue ASAP ! If you, Samsung wanna get my help, put me on your salary list !
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This Firmware is truely BUGGY LIKE 
. Exactly, in fact that Firmware destroyed, yeah devastated 4K Viewing Experience on my 8k Q900 (2018). That's such a most critically, ugly mistake of that company. By this practice, they Will Loose a LOT of customers, for sure. Not because of that silly YT app which even cannot play 8k on an 8k TV. No. Their update philosophy, is just like noobs would do. Are there any Test methods at Samsung? Why i pay 4000€ and you engineers give me such a bad feeling when using Samsung Products?
I definitely will look out for other manufatures in the future. Let's see when the final firmware will be deployed which makes the TV unusable slow and they try to make people think, oh, the TV got old, have to buy a new samsung TV." Yes, let's  the earth and it's resources.
Funny thing, when the Firmware update was showing up on the Q900 8K TV, i selected "do not install now". And even Automatic Updates are OFF, the TV updated the firmware without my confirmation. And that happened after i found out that this firmware has a BIG issue.
Unbelievable, Samsung treat their Customers as Beta Firmware Testers (or even Alpha?).
By the way, send me a new Remote, that beautiful shiny piece of technology works like  ah, forget it.
Samsung, i expect Your Apologize and a Solution ASAP!
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