Dell 5100MP problems

We have purchased seven of the Dell 5100MP projectors. We love the features and how bright and clear it projects, but we have had overheated failures on five of the seven units we have purchased. The interesting part of the failure is that it happens when we power on the unit sometimes first thing in the morning. We are able to get the unit to restart only when we disconnect the power cord from the power source. The unit will run all day after it has restarted. Three of the five have failed multiple times. The units are mounted from the ceiling in an air conditioned room. We do not beleive it is a heat issue but some kind of sensor problem. The only option Dell has given us is to unplug the projector for ten minutes and restart unit. Dell has agreed to replace all the units we are having problems with.

 

Tj