I have an acekard2i with a 8gb microsd running flawlessly on my dslite for about 1 year until now. 2 days ago I noticed it started to overheat while playing. I could feel the heat on my fingers on the back of the dsl. I also notice the heat comes from the microsd, not the ak itself. It gets really hot in a matter of minutes. I'm avoiding using it fearing damage to my dsl. I formated the microsd with panasonic formater some weeks ago and it was working normally until now. I also have a R4 original. It works without any problem.