I had this issue with the old wiring on the chandelier along with light flickering, so I rewired the chandelier with new sockets and 2ft. leads into the main house wiring as it had been before. Same issue was happening, so I replaced the dimmer switch, same issue happening. I bought all new dimmable light bulbs as a last resort but alas, same issue, as soon as I install the third bulb the other 2 go off. Any ideas? Can this be caused by the house wiring itself? Thank you so much for reading, this has me completely baffled. :O)