This has not been solved with Mondays patch - and I have been informed that it happened occasionally when flare/chaff was launched in 1.2.6. (but not in 1.2.7)
If anything this is worse in the current build, occurs much more often. It is for all intents and purposes, unplayable. Same thing happens - screen blacks out, sound continues although periodically cuts out, and the game then returns to normal.
Have tried absolutely everything now. Reinstalled DCS, Visual C++, DirectX, Audio drivers, Graphics drivers, Run as admin, turned off anti-virus. And it leaves no crash log as DCS does not "crash" so to speak.