It sounds like it’s a general issue with most of Apple’s “thin” laptops. I doubt it affects the non-retina 2012 MBP but good to check it out.
As a pint of issue: the displayport component is never affected by this issue. Even when my Promise RAID disconnects the displayport monitor (daisy chained) does not cut out. It’s something specific with thunderbolt, not displayport.
Either way we will find out in a couple weeks if the laptop comes back fixed.