Troubleshooting disk removal issues with T430 & Perc H730

I am looking for assistance in troubleshooting some issues I'm having with a six year old Dell T430 that's begun having issues with "losing" disks over the past month.

There is a Dell 800GB SSD RAID-1 pair in the drive enclosure and a 300GB SAS RAID-6 array. Both are being driven by a Perc H730. All is new equipment purchased from Dell and not used/refurb gear.

A month ago the iDRAC on the box reported that Disk 0, the first SSD was removed. I investigated and didn't see any errors on the disk, so I removed it and reinstalled it, and the array rebuilt successfully. Maybe a fluke, maybe not.

Fast forward to this week and now Disk 1 shows the exact same error messages, "Event Message: Disk 1 in Backplane 1 of RAID Controller in Slot 3 is not functioning correctly." followed by the virtual disk degrading and then "Disk 1 in Backplane 1 of RAID Controller in Slot 3 is removed."

This time I shut the server down and inspected the backplane and cables and re-seated the H730 card.

I rebooted and the RAID card immediately started to rebuild the array.

In the event the problem continues occurring what can I do to further narrow it down so I don't look towards replacement of the backplane, all associated cables and the H730 as well?

Thanks.