Powering speakers on/off puts rMBP to sleep.

I have a mid-2012 rMBP running Yosemite 10.10.1
I'm using it in clamshell mode, running one external display on HDMI, and another from thunderbolt.
If I turn my speakers off it puts the computer to sleep and turns off the displays. This happens 90% of the time, but not every time.
Sometimes this also happens when I turn them on, but not as often.
This also happens if I unplug the charger from the MBP.
Power outlet - > Surge protection (SP) with split:
SP A: Always on -> displays, HDD's, audio interface etc.
SP B: on/off switch -> speakers, keyboard
This way I use the switch on the SP to turn my speakers on and off.
If I disconnect the speakers from the switch and flip it on/off I do not get the MBP to go to sleep.
The power to the MBP is straight from the power outlet.

up?
Anyone?

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