External Display is wavy.

I have my MBP hooked up to an Envision Professional Series 22" widescreen LCD monitor (MBP DVI port to DVI/VGA adapter). Most of the time, it works perfectly at 1680x1050 60 Hz, however, sometimes the pictures becomes wavy. The image wobbles back and forth slightly. It doesn't make it impossible to view, but very annoying. If I change the resolution to anything less it seems to sure up the wave, however the image quality becomes pretty terrible. If I ignore it, the waviness tends to go away after a few minutes.

Bought a DVI cable and did-away with the DVI to VGA adapter. The waviness hasn't been present since.

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