4K movies freezing and turn to pink mush

[SamTzu 5]

Took me a while to figure this out. Hope this helps others.
I moved from Finland to Spain.
Network in my new place was not what I was used to.
Most of my 4K media became unwatchable.

Turns out that some years back I had manually adapted my network speed settings in emby and now that network nolonger had 10Gbit connectivity my larger files did not play well.

If you are suffering from similar issues check emby APP settings. (Up right corner.)