To better assist you with your inquiry, please provide us with the model of your system board you are using and the BIOS level it is at.
Were you able to complete rebuild to Drive 4. I noticed that in one of the screenshots it was not listed and Drive 5 was showing S.M.A.R.T. events. Then, later on I see Drive 4 as Member Disk and Drive 5 showing as “Error Occurred”.
My concerns is if Drive 5 dropped out of the array without Drive 4 completing the rebuild process.