Little bit of my recent experience, don't know if it will help but here we go...
In last couple of weeks DCS was just completely shutting my pc down. Now i knew that was power issue with gfx, but couldn't work it out why only on DCS was the problem. I put my pc under heavy load with ARMA 3 on maxed out setting to see it performance. Now my gtx 580 was under 100% load but temperature was around 90c steady, I was getting fps issues but game run fine. DCS on the other hand regardless of video settings was cooking my gpu under 5 minutes till it force shut down. Didn't really understand why my card was running BBQ when work load was under 60% (lowest possible setting or everything maxed out) with fps going around 90 or capped at 60. It just kept powering down.
Now the only hardware change that I did in last few months was getting USB card extension. I checked again if my psu can take on all components ( http://www.extreme.outervision.com/psucalculatorlite.jsp ) and I decided to remove it and see if it will change things. I've opened my pc and BANG! Noticed that there is small amount of dust on card radiator, nothing big but decided to get this sorted. Put card back, boot it up, started DCS and no crashes. Under 85c temps rock steady.
To be honest i couldn't really believe that bit dusty card was getting molested by DCS (and i mean bit dusty, not clogged up like it was doing all hovering in house past 6 months).
Check if you PSU can run all you got inside.
Check four individual components failures (remove them and try running DCS)
Check your streaming options, overlays (even on other software you run), capture source (make sure that's its set to monitor 1 and not window). Also try running DCS before you will fire up OBS.
dunno
It might be many things ...