I'm affected by this, too. Currently hitting F10 in multiplayer is basically playing Russian roulette with SteamVR.
At no point does DCS or SteamVR crash; SteamVR just apparently throws in the towel when the game can't draw frames fast enough and stops rendering to the HMD, which goes black. WMR headtracking stays on, the desktop mirror stays on and DCS continues to run at a slideshow-like frame rates until it is shut down manually. I actually finished one desperate JDAM strike in multiplayer with goggles on my forehead when VR stopped working at the ingress point
Frame rates tend to go down over longer multiplayer sessions with multiple respawns and the game has to be restarted at regular intervals to prevent this issue from happening. Usually the Windows task manager shows VRServer.exe eating some 70 % of GPU while DCS only gets 30ish %, when the normal ratio at game startup is like 10:90.
Relevant specs are 2070 Super with 8 GB VRAM, 32 GB system RAM, i10600K, HP Reverb, 1.0 PD, 150 % SS. Only the builtin SteamVR left eye mirror that can't be disabled is on.