Gaming MK8D and item/contact issues

[DiscostewSM]

So lately, I've been seeing major issues when playing the game, particularly in battle mode. At random points during a match, I'll end up with what's known as the Item glitch, where I basically cannot quick-select items, and all I get are single Green shells. Even worse is that during this time, I am completely unable to attack anyone to get points. I see them get hit, spin out, and come to a stop, but no points. Now it gets worse than that. during this time, I see other players getting all sorts of items, and all have been able to hit me.

It isn't so much of an issue with Racing, but the item glitch does come into play, and when in first, I'd get double coins, and any other place causes me to get mushrooms. Again, like in Battle mode, everyone else gets items like there's no problem.