Hi, Alfredo. Say, which version of the plane are you using? The current one would be 4.6, showing as 4600 or something on the installer. The older ones could develop problems with faulty FSUIPC installations, hence my question.

Well, to rule out any weather influence, can you perform a few flights with setting FSX to default weather, perhaps with the 'all clear' (don't know the exact name) preset? If the issue still comes up, can you describe how it usually starts?