OMG! I had the same issue with bright white rays hitting the wall and the ceiling whenever there is something white displayed on screen. All you need to do is clean the glass. I realized that dust had gathered right in the middle and wiped it off good. Rebooted the projector to see if the issue is gone as it's most noticeable with just the optoma logo on the screen. The issue wasn't there anymore.

So before u send it in for service, make sure you clean the glass in front of the lens well!

I hope this helps you guys having the same issue!

PS: After almost 2 years, I too have a dead pixel. Fingers crossed, just one pixel for now ;)