browser freezes when using Samsung P2770HD as external monitor....

Using original MBP updated to OS X 10.6.4 with wireless keyboard and wireless trackpad + Samsung P2770HD as external monitor. Using clamshell mode. Browser freezes on and off. Only happens when connected to monitor. If I unplug monitor, browser (Safari) works fine, even with wireless keyboard & trackpad. Plug in monitor again and browser starts freezing again.

Any suggestions besides buying a different monitor?