Computer restarts when powering down Lacie TB HD after updating to 10.10.2

Hello -

I was wondering if anybody else is having an issue with their Lacie or other external Thunderbolt hard drives after updating to 10.10.2?

I noticed this morning after un-mounting my Lacie Thunderbolt external drive and powering it off my iMac's screen flickered a few times and then restarted, if anybody else is having this same issue? If so have you found a fix?

Thanks!

justin