HDMI output cuts out and then comes back, any ideas?

Hi all.
I have a two Dell U2412Ms connected to my MacBook Pro Retina. One is connected via a Displayport connection and the other via the HDMI. I used to have them both connected to the Displayport conenctors but have recently run a cable into my office and now have the ethernet dongle connected to one of the Thunderbolt ports.
Since connecting a screen to the HDMI port, I've noticed that it does something odd from time to time. The screen connected to the HDMI port will go off for a couple of seconds, and then come back on again. It tends to only do this once per 'session' of me using the system. Most times when the screen comes back on, it is fine - but once it came back on the screen was going bananas. It appeared to be mostly grey, but looking closer revealed that all the pixels were going nuts, like a swarm of flies - and there was all sorts of colours going on! I had to unplug the HDMI connection (which caused my windows to move around) and then reconnect it, and then it was fine.
This only happens when using the HDMI port, and is not the monitor at fault - I eliminated it by swapping the screens over so that the other one was using the HDMI .. and it still happened!

As it turns out, the USB failed. The Apple people kept my PB and sent it for repair.
I dropped by the genius bar and left it with them on Dec 14 being told it would take 10 business days or so to get it back.
My trackpad button was very stiff, it stuck and had to press harder than normal to click. This was in effect since I took it out of the box when I bought it. Never bothered as I use a Bluetooth Apple mouse. Now that they kept it for repair for the USB port, they will also fix the trackpad.

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