Closed clamshell mode on mba 13" - Keeps loggin out every 30 seconds

I'm trying to use my MBA 13" in Closed clamshell mode, connected to a 27" Thunderbolt Display
however it's not working-
Every 30 seconds or so, it locks the screen, and makes me log in again.
I have just reset my MBA to factory settings to see if that would fix it -
Same problem.
I also have a 13" MBPr - if i connect this to the same Thunderbolt display, I can operate it in closed clamshell mode no problem
Any idea what's causing the problem?

Oh..
And i "meet the criteria" for closed clamshell -
It's plugged in, external keyboard (bluetooth) and external mouse (bluetooth)

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