Yes, this is a concern of mine. The NAS I am using is known for running hot, and a lot of 3rd party solutions have cropped up. As it is, the disks are running around 50-55º C, which seems sub-optimal. Anyway, all the errors have been squashed for now.
My advice for others who find this thread: go here
To document what I did:
sudo zpool status -v
I found the files that were corrupted and replaced them from a backup.
sudo zpool clear (to clear the errors)
Then scrubbed the zpool.
After that all is good 
Thanks you Joe and Art.