Something helped.....
1) Moved OS system page file back to default (C:\Drive)(Set fixed size @16384)
2) Changed default snap FOV settings greater than 130 (140) to 130.
3) Changed NVIDIA Max pre-render frames to 1.
Still testing.... but no crashes in A10C training missions or instant action missions as before.
Still have small micro stutters occasionally, but no DCS.exe hangs, good FPS @ 50~60.
WIN10 64, 2600K @ 3.5Ghz, GTX980, 16Gb Ram, Triple Monitor (PLP 4360x1440), Custom Monitor.lua / 1Camera.lua
Update: Tried Max pre-render frames to 2, lock-up/crashes came back. Back to 1 pre-render in NVIDIA (391.01) setting for custom profile for DCS. dcs_log.txt