Exact same situation here with my 2017 MacBook Pro (touch bar). After gaming for 1-2 hours it slowly creeps up the bottom of the screen. I usually stop and shut down for a few hours.
I recently had my fans cleaned and got new thermal gel. I also use TP Pro to boost my fans early before the system gets too hot but the problem persists (and is getting worse).
Exact same situation here with my 2017 MacBook Pro (touch bar). After gaming for 1-2 hours it slowly creeps up the bottom of the screen. I usually stop and shut down for a few hours.
I recently had my fans cleaned and got new thermal gel. I also use TP Pro to boost my fans early before the system gets too hot but the problem persists (and is getting worse).
:(