note 5 call delay problem

hello there , i am asking about a problem i faced after marshmallow upgrading for my n920c (galaxy note 5) , the problem is some outgoing voice calls get huge delay before making the first ring , it took like 20sec , then i downgraded to android 5 never appear , i tried many ways to solve , like changing the carrier provider , try several roms , kernels (all of them), make a factory reset (several times) nothing helped , it seems like nobody have solution for it , and the most annoying thing that it appear on nougat also . anybody could help ? plz .

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