In-game Black-Screen after patch 4.12.1

My PC freezes and I’m getting a black-screen every online game after the new patch, the screen disconnects and reconnect (no signal for 10 seconds) this is limited to SC2 all other 3D games are OK. i updated windows driver, video card drivers,changed graphics settings…etc with no luck. i noticed Battle.net is frozen in the background each time the crash happens and the game plays normal after the 10s freeze!
My hardware:
Devil RX Vega 64
I7-8700K
Win 10 Pro

Hello XenFMA!

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