I wouldn't really call it an issue because I love how it runs. I'm guessing it was user error because after tattooing I went back and loaded it up with the RPG and a ttech, a ttech grip and cartridge, and a standard needle and disposable tube and didn't have any heat issues with any of the set ups. I'm guessing I was doing something wrong because I couldn't replicate the problem. Thanks for offering the help gaston. I appreciated it. I love this machine!