I will attempt to keep this short, I'm truly thankful for anyone who might have an idea on how I can proceed.
Honeycomb Yoke; Saitek/Logitech flight panels (Multi, Radio, Switch) using the original NEXT drivers; CH Pro Pedals and x2 Throttle quadrants - all connected via a 3.0 Powered USB Hub to a laptop
FSUIPC - all controls are assigned through FSUIPC and assignments removed from FSX controls menu
Carenado 690B v1.2
Known issue: Engine 1 and/or 2 failures (never simultaneously), mainly on the ground but also in the air. (mainly on the ground because that's where I stay)
Supporting Data: The FSUIPC Log shows the follow every time this occurs (example for ENG2):
*** EVENT: Cntrl= 65992 (0x000101c8), Param= 1 (0x00000001) MIXTURE2_LEAN
*** EVENT: Cntrl= 65988 (0x000101c4), Param= 1 (0x00000001) MIXTURE2_RICH
Hypothesis: When the above happens the engine fails, I believe I have also seen the Condition lever "bump" in the Virtual Cockpit View to Emergency Cut Off then back and bounce back to where it was.... at this point I can restart the engine BUT the length of time before it happens again is seconds to minutes. I believe preventing the mixture change to "LEAN" this the key to stopping this issue.
Attempted changes (none with positive results) :
Full reinstall; Bill's v5 Mod (do I also need v1-v4 or is everything included in v5?); unassigned mixture 1 and 2 to throttle quadrants; disabled/enabled axes filtering in FSUIPC... there are so many variables
I have also run FSX without any external controls plugged in (flown with only a keyboard) and there were no issues. I also had a flight without any failures using all the controls.... I'm dumbfounded what to try next.