Game goes BLACK SCREEN seconda half

Hey there everyone i took a while to see other topics ... but none gone like mine so here it is

So this happens when im playing Clan War , basically i can easly and nicely play first half of the game when the first half is oveer the screen goes black ... or somethimes the game simply crashes without the screen going black .
While playing public everything is well .

PS : i tryed reinstalling the game several times