Actually it keeps doing it, no error message it just freezes and go straight to desktop.
if loaded prior lauching a flight it is fine but as soon as AS loads weather it crashes and go straight back to the desktop.
in event viewer I have this message
Faulting application name: Prepar3D.exe, version: 220.127.116.11097, time stamp: 0x5d8abf93
Faulting module name: KERNELBASE.dll, version: 10.0.18362.418, time stamp: 0xfba22159
Exception code: 0xc0020001
Fault offset: 0x000000000003a839
Faulting process id: 0x2de0
Faulting application start time: 0x01d5af67cd22ceec
Faulting application path: D:\Program Files\Lockheed Martin\Prepar3D v4\Prepar3D.exe
Faulting module path: C:\WINDOWS\System32\KERNELBASE.dll
Report Id: 5ea7f675-02c0-41e5-a779-5542186cc229
Faulting package full name:
Faulting package-relative application ID: