RAID 5 mode was not changed my side.
I did replace a drive about 1-2 weeks ago and it successfully rebuilt (took about 13 hours) the RAID. I ran both Quick Test, Full Test and System Test and no errors were reported in the LOG.
The more critical issue for me was not the reboot time (annoying but not critical) but the “Error 0x8007003B: An unexpected network error occurred.” see my other post here: https://community.wd.com/t/files-fail-to-copy-0x8007003b-unexpected-network-error/241997
But like I’ve said, I needed to get this resolved and to a reliable position and have since dumped the EX4 and bought a QNAP and no issues with it so far … RAID 6.