Same crashing problem here.
Got random crash when trying to enter instant action or connect to multiplayer server
Try to fix it using dcs_updater but seems didn't work
Enable or disable fullscreen didn't solve it
Today I just got my first crash while flying in GS server.
My computer is AMD 3700X cpu, 32G Ram and RTX 3090, I installed DCS in 970evo 1T SSD with more than 400G space left