Hello, I would like to let you know that if you want to test the Solid State Drives individually for errors and you want to use the Solid State Drive toolbox you need to break the RAID array since the toolbox cannot when RAID is enabled.
I emailed Intel support and they advised that I make sure all the drivers and bios were up to date, restore everything back to stock clock, and then split the drives and check them via Intel Toolbox.
I did not want to split the SSD's yet since I did not believe that both SSD's could be faulty at the exact same time
Then how about you run your system at stock speed and not overclocked?
Overclock the CPU affects bus clock speeds of other chip/controllers that are linked too the same base clock.
Also update you BIOS this will likely disable RAID when updated but enabling back to RAID will not causes you to loss your RAID as that info is on your SSD's for it to stay in RAID.
I'm not sure if running a run diagnostic scan from toolbox is a wise as it seems to write to the SSD for testing.
“Run Fast Diagnostic Scan
Use this option to perform a quick check on the health of an Intel SSD.
The scan checks 1.5 GB of the SSD for READ errors. The scan then creates 1 GB of random data and then compares it for data integrity. The scan takes approximately three to five minutes to complete and requires a minimum of 5GB of unutilized space to run.
If it creates 1 GB then an SSD out of RAID will likely corrupt what you had on their.