Question about ASUS ROG Strix XG32UQ

Hello, I have the following problem When gaming, I have a black screen for 1 second in some games, 4k 160 heart set on the monitor g-synch active. But if i switch off the overclocking of the monitor and it runs with max.144 heart i don't have this problem,or if i deactivate g synch everything is ok. As I said, the problem only occurs with some games. Display port cable has already been replaced, graphics card drivers up to date.