X200 - External display is intermittently interrupted (Driver 8.15.10.1855)

Hi all,
I use Windows 7 and the X200 display driver on the official driver page.
The version is 8.15.10.1855
I also use a Ultrabase, and connect it to the external LCD through DisplayPort.
Sometimes the external LCD would start to flicker, then become black for several second,
and resume automatically.
Does anybody also encounter the same problem?
Thank you!

I bit the bullet and bought the Displayport to DVI connector. It cost me USD25. I'm now using the DVI port on the Dell U2410. It's been a couple of hours (fingers and toes still crossed) and no flicker so far, so I think it's a Displayport issue.
If this works, then I would attribute it to the implementation of Displayport on the X200 and Ultrabase because when I connect using the Displayport connector from my desktop to the same monitor, there are no problems whatsoever.

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