NetGear NAS (rn102) with two WD Red 3TB drives. Have had it for about two years. Works well but had to replace it with a larger unit.
Are the drives showing any signs of wear? Can you perhaps get a SMART status of them?
Michael Murphy | https://murfy.nzA quick guide to picking the right ISP | The Router Guide | Community UniFi Cloud Controller | Ubiquiti Edgerouter Tutorial | Sharesies
Keen if pbolger doesnt take it.