I had the same "results" over and over.
Read my discussion "Matrix Storage RAID1 repeatedly marks drive 2 as failed".
Over and over I marked the subject drive as "good" and rebuild starts.
I mentioned having tested and swapped drives to no avail.
After a couple of days the troubles start again and again.
You probably will get the same results.
I have dropped RAID on desktop boards entirely.
Both former RAID drives now behave.
The only thing is now each day one has to make a backup of the data.
System drive is done using Acronis each time new programs or patches are installed.
I feel happier now and it's costing me less time to safe-keep my data.