game crash on lollipop

Hi i am making a game its not a complicated game just a platformer with some particles and stuff the game works fine in unity with no errors i build it to test on my samsung j7 lollipop it kept crashing and it didnt work as fast as the game like it kept pausing i tried to see the error i found no exceptions only failed to mount storage and the path has external storage even tho in my build i never used external storage and forced internal then i tried it on note which is marshmallow it worked fine so i wanna ask are there any stuff like a code or texture format or anything that can make a game crash on prev versions of the android if there please tell me so i can fix it or if you have seen this error before can you tell me what you did to fix it and thanks