External Monitor "shivers" on MacBook Air

I have attached a 27" HP 2711x monitor to my MacBook Air using the mini-port->vga adaptor. The display is recognised as HP 2711 and the resolution is set to 1920x1080. Looks great.
However, every so often (like every 3-5 minutes), the whole display 'shivers'. If I set the resolution to the next lowest (1680x1050) I get the same problem. If I set the resolution to 1600x1024, the shivering occurs constantly. If I go lower then the display settles down and works without shivering, but now I've lost the benefit of the high-res display...I'm currently writing this with the external display set to 1600x900, no shivering...
Reading a few threads, looks like switching to DVI or HDMI might work better, so I'm going to get a dvi adaptor and try that.
Any thoughts on what's going on?
I'm running Snow Leopard 10.6.8 on a MacBook Air from 2011 (2.13Ghz Core2 Duo, 4Gb DDR3, NVidia GeForce 320M)
I read on one thread that the latest drivers from nVidia helped so I have the CUDA 4.2.10 drivers installed.

Bought the mini display port -> dvi adaptor, plugged in the dvi and everything seems to be fixed.
Nice crisp 1920x1080 display, no shivers...
Looks like the signal from vga is not robust enough for this resolution.
Solved.

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