AS2012 Multiple wind direction changes in one second

Hi,first of all - I'm not a native speaker but i hope I'm able to describe my problem. After 30-40 minutes of flying on cruising altitude (with PMDGs NGX) and stable wind conditions (e.g. 290/60) the wind speed drops instantly to 5 kts and the direction begins to shift rapidly (e.g. from 250-253 and back - multiple times). This goes on for a couple of minutes and suddenly the wind speed goes back to 60 kts and the plane crashes. I did everything written in the README like adjusting the turbulence scale and disabling turbulence effects but it didn't work.I also tried flying with and without previously entering a flight plan into AS2012 but without success. I'm not using FSUPIC.Any suggestions?Best regards

Edited January 10, 201214 yr by tgsurf