Launch Arma 3
Start VTOL showcase
Proceed through first few tasks
Continue playing until game locks -- usually occurs around pilot rescue task, or free-roam optional CAS phase at the end

I've run into this issue several times. I have tried disabling all mods, and have also completely reinstalled the game; no luck.

I have also flown extensively in the Fixed Wing and Fighter Jets showcases, as well a few simple custom missions (using the CH-47 and F-181), and have NOT seen the issue in any of those missions.

I played Arma 3 very frequently from launch until about a year ago, before taking break. Having returned to the game this past week, I'm experiencing these errors for the first time. This leads me to believe it's a relatively new issue that was introduced in the last 12-18 months.