Hmm, ok - this sounded like the other bug another user reported - he was using ActiveSky, I think - and that one seems to have a problem with generating "turbulence" and there is also seemingly a problem loading wind layers into X-Plane 11.30. Not sure about VATSIM.
I haven´t encountered anything like that, but I don´t use real weather and I could imagine that if there was a problem with loading real-weather-wind-layers (as it is reported for 11.30) then going from one layer to the next could make this happen.
Cheers, Jan