I did a DCS repair. Still crashed. I then started disabling add-ons. I disabled Helios and removed the Export.lua. Flew without a crash, although still a lot of micro-stutters and a few 4-second pauses at some points. So there's definitely something going on, and it seems like Helios may have aggravated it. At least I can get through the mission, although flying without Helios and my touchscreen MFDs sucks!