Just bought this today and brought it home to replace my older model that died.
Plugged it to my PS4/Switch and then proceeded to waste 6 hours trying to get it to work.
The game mode feature is broken. It leads to a horrible stutter that happens about every 5-10 seconds.
It seems to be trigger by switching to an input that already has Game Mode on, or anytime HDR is engaged while game mode is on.
The only fix is to turn Game Mode back off than back on.
That's only temporary, because as soon as you turn off the TV, or switch inputs or run HDR content the stuttering lag returns.
This is clearly a software issue, I've seen other topics with video evidence of this same problem.
If theres no news of this being fixed soon I'll be returning the T.V. and never buy a Roku product again.