Rebuilding Raid 5 after HD issue causes issues because SoftRaid Stops rebuilding

I am currently rebuilding a RAID array on my Thunder Bay 4 unit because one of the hard drives appears to be faulty. I installed the replacement drive, followed the necessary steps, and the OWC software is now reconstructing the RAID. Since this is a 36-terabyte array, I appreciate that the process will take considerable time. However, the SoftRAID application displays wildly fluctuating estimates for the remaining time, jumping from 490 hours to 120 hours and varying constantly. Furthermore, it seems the rebuilding halts entirely at times. I left the application running in the background for several hours, but when I switched back to it, the time remaining had vanished, and there was no progress in the current offset or I/O requests, which was quite unexpected. Once the app was brought to the foreground for a short period, the process appeared to resume suddenly. I suspect it had paused for an extended duration. The computer has not entered sleep mode, as I am using Amphetamine to keep it active. At this rate, the reconstruction looks set to take several weeks.