Freeze during video

[fr0nk]

Spec: i5 6500 , H170 M3 , R9 380 4GB , DDR4 8GB 2133MHZ

As the title , when i play video on YT (mostly) or when i'm scrolling between media content on Facebook with Firefox or Safari on High Sierra , my machine enterely freeze and i must force reboot.
How can i solve this?

 

[VioletDragon]

Spec: i5 6500 , H170 M3 , R9 380 4GB , DDR4 8GB 2133MHZ

As the title , when i play video on YT (mostly) or when i'm scrolling between media content on Facebook with Firefox or Safari on High Sierra , my machine enterely freeze and i must force reboot.
How can i solve this?

Sounds like a Graphics Problem.