Hi Eric,
As you know I have the Z2, I guess I've never noticed this problem. Actually, I don't think the Z2 has more than 1 fan, it just works in different speeds depending on the lamp mode (hi or economy). I have read on AVSforum.com that others have noticed the fan fluctuating up/down, I assume this is that the room temprature is warm enough that it has to kick on to cool it down.
I have my Z2 in the basement of our house, which is always much cooler than upstairs. I never notice it increasing speed. What is the room temprature where you have the Z2. Also, do you have it near any heating vents in the room that might be blowing on it?
You might want to post this question on AVSforum in the "Under $3500 Projector forum" I know there is ways you can go into the service menu and tweek the setting for the fan.
Not sure what else to say at this point...
Randy
