ZPool Checksum Errors w/ Win8.1 search

I've had my FreeNAS box up and running for about 6 months now and I've recently added a Windows 8.1 machine to my network. I've noticed, with moderate repeat-ability, that whenever I use Win8's search on a mapped drive to a CIFS share with hundreds of folders and thousands of files I almost always come in the next day to a FreeNAS report of checksum errors on random drives. Typically only one or two error counts.

Is this typical or have I misconfigured something? Is there a better way to...

ZPool Checksum Errors w/ Win8.1 search