Cellphone hangs whereas gaming.

I’ve a OnePlus 8 that has 8 gb ram and 128 gb rom with a snapdragon 856 as effectively. My cellphone has by no means hanged or lagged like this earlier than other than the one time I turned on drive 4x msaa and it was mounted after I turned it off. I’ve no storage points, bunch of free house. I clear cache reminiscence. no further apps working within the background. I can't appear to determine what causes this downside. Any assist could be appreciated.