My 15TB DS1511+ from 2011 would like a word.
I only recently replaced a failed HDD and power supply, but otherwise going mostly strong. It will stop responding to the network out of the blue on occasion, but a power cycle gets it back in order.
But I’ve had redundancy for a while with S3, then later (and currently) BackBlaze.
I’ve been looking into replacing it, but I’m hearing Synology hardware and software isn’t as great as it used to be, which is unfortunate, because this thing has been a tank.