2007 GTI. Started about a week ago, really first time out this year. It will start fine, be sluggish for a few minutes then just bust out into full rpm’s, then after about 20-30 minutes just shuts off like you hit the stop button. Reinstall lanyard and gauge cluster comes on, says welcome aboard, and does nothing. No beeps, no codes. Towed it back and trailered it, checked fuses okay, battery terminals clean, came back today and fires right up. 20 minutes later same thing, sluggish, then wide open, ride a few minutes and dies again. Towed back to ramp, loaded on trailer. Put key back in and magically beeps and fires up. Posts for DESS are clean, fuses good, terminals good. I have a heavy equipment and truck background, and usually when that happens it’s an ECM issue when they get hot. I’m at a loss here, do they store codes like a truck in the ECM? The sluggish rpm’s related to other issue? Thanks