This is the reply I finally received from Optoma:
please be advise of the following information in regards to your lamp.
Once lamp turn on about after 20 second turn off.
1 if lamp are weak it takes more current when turn on, if the ballast allow high demand of current by lamp to continue eventually lamp will blow with loud noise and scatter lamp glass into pieces. To avoid this to happen a monitor system is in place to check and balance the lamp current if it takes more current the circuit will cut the supply to lamp ballast. This is what happening now.
At the same time it Industry stand from all Manufacture lamp are covered only for 90day, it's when you purchased projector and clear state in warranty card.
The reason for failing could be different case.
Lamp life for a projector will vary based on many factors including application, installation, and intake of cool air and exhaust of hot air, usage, and proper maintenance. Heat buildup can reduce lamp life and even damage your projector. Here are some tips to help your projector lamps last longer.
Once you turn on your projector, wait at least five minutes before turning it off to allow the fan to properly cool the unit. After the fan has cooled your projector, you may unplug it and store it as desired.
Do not obstruct the air intake or exhaust vent. Paper should not be placed on top of a projector, or where vents are located.
Keep the exhaust vent at least two feet from any object.
If the projector is built into a compartment, wall, ceiling or shelf mount, the minimum distance requirement (usually at least two feet) stated in your owners manual must be maintained.
Clean the projector's air intake filter every three to six months -- or more frequently -- based on your operating environment.
Do not move your projector until the lamp has cooled (about five minutes).
Run your projector for two weeks and/or 20 hours shortly after your purchase. If the lamp is going to fail, it will usually occur within the first ten hours of operation. Lamp warranties typically last just 90-180 days from the date of purchase, rather than the first installation.
When you purchase a replacement lamp for your projector, remove the existing lamp and use the old lamp as your spare. If your projector is new, test the original lamp for the two weeks/20 hours before removing and storing as a spare.
Please let us know your approval.
What ********. I can't believe what a joke this company is.