Default [Q] SD card corrupting the system?

I recently got the tab 3 7.0 and put the kidz room on it. Everything was working fine until I bought a 32GB san disk SD card. When I put that in, the kids mode constantly crashes, applications can't start or force close. When I pull the card out everything works fine again. I have nothing but a few mkv and avi files on the sd card. Does that make sense to anyone? The card is formatted as FAT32. I think I'll try exFAT and see if that makes a difference, but what the heck?