Red LAMP on my H6518BD after 15 min

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PerLa60
PerLa60 Member Posts: 1 New User
Hello
I have replaced the lamp but its still a problem. 
I start the projector. It works fine approx 15 min. Then I hear 3 bip’s, the red LAMP light solid, the lamp turnes off and the projector goes off.
start it again and the same symtom after a shorter time.
The projector is very clean from dust and I have tried factory reset. 
Do you have any explanation or solution for this?