2160 video in 1080 mode twitches F/W 1.2.7

1.2.7 f/w when playing 2160 video in 1080 mode and switching frequency at 23.976 and 59.94 video twitches. Why?
1.2.6 f/w all played smoothly.

 

I've got the same problem.
Solved by forcing screen resolution to 4K instead of leaving AUTO

 

I have 1080 TV, but I have a lot of beautiful video in 2160

 

Sorry, my mistake in reading... I own a 4k TV set...

 

Check it out at home, the TV 1080p and 2160p video really goes smoothly on firmware 1.2.6, but in the new 1.2.7 is the same video jerks and brakes

 

Same here. 2160p in 1080/24p or force to 2160/24p stutters extremly. unwatchable.

Checked reset, direct link to 4k tv (without av receiver), hdmi rx version differences, ... 2160p doesnt work at all..only stuttering..

 

@freeroc @spring @mirror
You know how to fix this problem?