This will not fix your unstable issue your dealing with, but when i build a new mining rig i always set the following change, it prevents windows from displaying the error that ccminer or whatever miner has stopped working and sits there waiting for a response to close the program. What this setting change does is just close the miner and allow the mining software to attempt to start mining again since it doesnt detect a active mining software open.

Start - run gpedit.msc
Go to Computer configuration -> Administrative templates -> Windows components -> Windows error reporting
Set "Prevent display of the user interface for critical errors" to "Enabled" and reboot your rig.
Next time when ccminer or other program will crash it will not show any GUI - just close and dont wait for key press
Hope it helps!