i7 6700K, 16Gb DDR4RAM, 512GB M.2 SSD, Gigabyte GTX980
you should now go into fault finding mode.
If you want to trace the cause of the issue , dont plug the other 2 drives in until you are 100% sure the system is stable.
Format the SSD & load win. Install drivers one at a time & move on when sure its stable .
It may even be a vid card issue, some faulty vids cards are file untill you install the driver .
I thought I'd give an update on this. After the last freeze I mentioned in my last post, I did a clean install of Win 10. I made sure to do the install with only the SSD connected, made sure that seemed stable for a few days then added the other 2 HDD's later. I used slightly different MB connectors for the drives this time, but still the Intel ones only.
So far, after almost a week, I haven't had the freezing problem yet.
I have had one crash, but it's not the same freezing problem as last time, as this time the PC had already rebooted itself overnight before I realised. (The previous problem was literally a freeze, no rebooting, and only way was hard power off). This crash seemed to trace back to a NVidia driver, and there was just a new update available last week, so I have now installed the latest driver.
So, I'm quietly optimistic that it may be fixed now. I have created a system restore point and will now slowly add back all my other apps.
Question - I thought about using Virtual Box to test some program installations there first - good idea? Or more trouble than it's worth?
Make a restore point now before you start reinstalling anything else. I would make an image of the C drive also.
That way you can easily get back to your present stable state If you need to.