Wastegate dissolves at high load

Hello, I’ve already written that my roadster has got a load pressure increase via software. However, the car now packs a bit around. If I allow the Wastegate then the car is very strong when I push through. (I know that the pressure is too high and therefore the mother of the Wastegate has to be turned out a little bit). If I turn the mother out so about 0.7cm then the smart works very well and accelerates neatly; it seems to be ok. However, if I drive longer than 5min under full load then the Wastegate dissolves completely and the car goes into the emergency run. That means the Wastegate is no longer connected to the long “screw” (which is connected to the underpressure box) . From this it can be concluded that the mother dissolves itself while driving. What can I do against it? I can hardly stick the mother o.ä? Does it bring something the 13-year-old mother to replace? mfg