I have used third party products for everything from controllers to memory and the expansion packs have always been problematic. They cause problems like crashing and loading issues. If you don't want to waste your money on things you will end up throwing away, stick with the Nintendo brand or OEM expansion pack. OEM is simply "original equipment manufacturer" which means that it is the same company that manufactured the original parts. Apparently the third party companies are not aware of certain things when manufacturing these products. They either do not test them properly or the original makers are not sharing the information on their hardware.