...That's not a good answer, even not an answer at all, because
Quote from your link,
"Intel® SSD 750 Series have been tested with selected motherboards. The focus of the testing is to make sure the operating system installs, and is fully functional as a boot volume."
As I mentioned in the beginning, I use the drive as a secondary drive. My system is installed at another drive.
"Successful test results provide a guide for a successful system build. Successful results do not guarantee compatibility with other hardware."
As your document addressed that even with your tested boards, they do not guarantee compatibility, only guarantee for a boot volume. My problem here has no relationship with the boot issue, so the article means nothing to me.
We are glad to know that it is working properly after you updated the drivers. We are sorry for the misunderstanding.
Intel recommends that in cases like this one, just make sure you're using the latest Intel(R) drivers. Let us know if you need anything regarding your Intel® SSD 750 Series.
You are more than welcome to contact our technical support for live troubleshooting as our technicians will be more than glad to assist you with this issue. You can contact us through this link, just make sure to choose the right region you are located in. Contact Support also, you might want to take a look in this link below for additional information. Intel® SSD 750 Series — Frequently Asked Questions (FAQ)