You totally lag when it comes to the point.
Yesterday or September, what does it matter, really? The game worked until the last time, in fact, worked like a charm, it was rock-solid, and delivered high FPS on near max settings. Now, a few months later, after not playing for a while, it crashes to desktop from the menu, from the world map. Not even starting a flight. On all occasions, 100% of the time. The game is fully updated, no hardware is replaced. Got it? If it worked fine the last time on the exact same system, there is no reason not to work on it today since the system is unchanged.
Almost.
Windows updates and obvious driver updates do happen. Either one of these introduced some incompatibility, or the game did. I’d rule out failing hardware as way too many people are affected.