I can't remember the last time I saw a receiver get open on a deep ball as often as I see MVS do it. I also can't remember the last time I saw a receiver drop as many of those deep balls that hit him in the hands.
I think the balls he has the most problems with consistently are the ones that come in at about stomach height. Having played some WR at a small college, I can tell you they can be tricky for the simple reason that they are not low enough or high enough to easily catch with your hands away from your body because the ball strike point is in a no-man's land between being underhand or overhand. You basically either have to train yourself to go low with an overhand position or get good at the basket catch. He's a professional and should have this figured our by now but I think I get it.
But really, you see teams across the league hit a deep TD throw fairly often but defenses don't often let that happen more than once a game. MVS seems to do it a lot (minus the games he completely disappears). He needs a sports psychologist or hypnotist or something to help him concentrate better during those types of opportunities.