Wii U Freezing???

I haven't been able to find ANY information on why my Wii U Zelda Edition has issues with Mario Kart 8 (Only a few tracks) it says the disc is unreadable, and now it freezes after being Dugongo in Hyrule Warriors. This is severely aggrivating and I don't want to lose my Limited Edition Console just to get it fixed. IF it can even be fixed. I've never had a problem with Nintendo till now.
Anyone else having these difficulties??
Anyone know what I can do about it???