I also am having issues with my w7000. Last fall it started kicking off randomly and showing the red lamp error light. Replacing the lamp didn't resolve the issue so in December I had Benq service do a diagnostic on it and they said all they could find was the blower was dirty and replaced it.
Now the problem is occurring again, plus I am now getting another issue where randomly the colors on the screen will start to severely flicker and then the projector throws orange/red light combo and shuts down. The color flicker occurs most frequently when I switch inputs on my receiver or first power on and sometimes, but not always, will stop if I select a different setting mode or temporarily switch inputs on the projector. Almost the entire screen flickers and colors are not accurate at all. I haven't made any changes to my set up and it worked ok for 5-6 months since it was last serviced. Also, once the flickering begins, it occurs on menu screens, etc, even on different inputs that aren't being used so it doesn't seem to be HDMI cable related or specific to my set up. Any thoughts on what could be causing the flicker issue?