Hi Weldergod. Are you refering to the problem of output variation due to increase in temperature? If so, how do you know that is the problem? I have contacted a couple of repair guys, and this is something that they have not had experience with so far. I live 130 miles from the nearest repair shop and since it is not causing me any down time to date, I hesitate to take it in for a diagnosis and lose work time if I don't have to. Thanks for your input!