External display flashes and shows 'snow'. (Video of behaviour included)

Since yesterday, my Macbook Pro is acting strange. When I connect it to an external monitor, it usually works. Everything goes well for 10 to 30 minutes, and at some point the display starts tearing, showing snow, and flashing. These flashes get worse and worse, up till the point where I have to reboot. Rebooting seems to help a little. Whenever the laptop hasn't been used for a few minutes it works correctly again, for a short while. (This makes me conclude it's some sort of heat-related issue)
The issue is present on multiple monitors using different DVI cables. I only have one mini-displayport to dvi adapter, so the problem could be there too.
This problem does not affect the internal display of the macbook in any way.
Here is a short video showing the behaviour:
http://www.youtube.com/watch?v=4BotUqHb3dM
What should I do? Try to figure out wether it's the mbp or the connector or just bring it in for a repair. (It's less than a year old)

I have had similar issues with my 15" MBP. Occasionally my external monitor will go 1980s and display what looks like crappy tv reception.
Also, connecting or disconnecting an external display (via the single link mini display port to dvi adapter) has a tendency to lock up the entire machine (both displays black, won't respond to keyboard or mouse) until the power is cycled.
Also, my built in monitor has a habit of flickering/glitching lines.
These problems seem to happen regardless of which graphics card is active.

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