Being that you've already changed the lamp and filter (with genuine Panny parts, no less), that eliminates the two most likely culprits. You mentioned "power entry module "; is that a known issue w/this model PJ? Didn't know about that issue w/this PJ, but based on the symptoms you're having, it seems that the lamp isn't getting enough juice to stay lit. Have you recently experienced a lightning strike or brownout in your area? It sure sounds like a hardware issue, unfortunately. Have you moved the PJ lately? Bumped it? Possibly (only guessing) some wire or daughterboard that should be firmly plugged in is only making intermittent contact? I'm a network admin/computer guy by trade and see this problem all the time in user PCs and on the ocassional server that's been worked on. Things get plugged back in, but not securely so connection passes electricity but can't carry the full load it's supposed to. Good luck and please do let us know what the problem was. Posting fixes always helps someone down the road.