Funny he knew what was comming before it even happened. I have an 08 300 D and it was the same way. I talked to a few other guys with the same machine and a couple of them said to run it hot and burn a bunch of 1/4 LH or 3/16 7010,hyp,8010 or something like that one rod after another and that would calm it down. It worked, well with my machine anyway. You might try that. Keep using it they are great welders no matter what some other people on here say.