[jeffhiggins]

For modern Macs, this seems like expected behaviour. My 2012 MacBook Pro and my late 2014 5k iMac regularly glitch out like this.

[SyneRyder]

I assume by 2012 MBP you mean the Retina model? I've never experienced anything like this on my mid-2012 non-Retina MBP. (Hard drive issues, yes, but not video glitches.)