Not sure for what reason, but mine has gone back to running rock solid.
 
1) I let my machine update all WIN10 updates. (back on auto updates.)
2) I am on latest Sonar Plat version
3) I renamed my audio.ini. (I did some nonsense a while ago to balance out my 8 cores.  I am back to hitting core 1 hard, but there is no impact to performance that I can tell.)
4) I shut down just about all background apps.
5) Disabled auto-save.  (cannot say for sure, but a lot of my crashes seemed to happen when I was editing and auto-save jumped in)
 
I had a friend over on Saturday recorded 6 hours straight without a hiccup.
 
I am not too worried about End Of Life for the Octa.  My son is still happily using my old firepod !  They don't stop working when they go end of life.
 
JR

Sh03e
 
Yeah in my case there's something with CA-2A, BT-Analog Trackbox and Rapture Pro, i can't open or insert that plugins without a risk of crash but after the crash (need to unplug and plug again my QuadCapture) SONAR can be opened again, there's something wrong here but i don't know who is responsible, if i use the rest of my audio arsenal, SONAR and Roland QuadCapture are rock solid, maybe the devs can figured out with the Event Logs i posted.

 
That problem is not with Roland Octa-Capture or Quad-Capture, that's a Cakewalk problem.
 
Click the the link for the resolution from Cakewalk
http://forum.cakewalk.com/1317-Update-Instability-with-certain-Cakewalk-plugins-after-recent-Windows-10-updates-m3526221.aspx
 

My QC runs better than ever in ASIO mode. When I updated to win 10 I didn't bother to optimize my laptop 'cuz everything seemed to be working. Last week I checked settings and also tried lowering the latency and was surprised when I could drop the buffer size from 128 to 64 and it's solid.

I will be testing to try to achieve lower latencies with plugs turned on....no issue at all if plugins are off while recording.

I track with the fx I plan on using, just not LP plugins or others that need look ahead and when I get to the mastering phase I up the buffer size. 

So far....love this interface....latency not an issue now..figured out necessary methods for my recording needs....Very pleased. Heck...I'm able to record live..while jamming with a song or reading lyrics on the net at the same time lol....Very convenient for learnin' a thing or two now n then ;-) it's a serious upgrade for recording...fun new tool functioning well