I agree with Engineer and oldsmoboat. I've had it happen, too - a poor contact in one socket causes shortened life of the bulb two ways. First, it causes frequent current surges through the bulb. But it also generates a lot of excess heat in the socket itself, thus raising the operating temperature of the bulb and shortening its life. Furthermore, the arcing this causes makes the problem worse as time goes on. Sometimes you can clean off all the contact points and fix it, but even better is to replace at least the actual socket and any pigtail leads into it, thus replacing all likely sources of intermittent contact. (By doing this, you will even open and re-make the connections to the supply wires, thus probably cleaning them off, too.)
As an example, I have had this occur twice: ceramic socket with screw terminals for power leads, but the connection from the metal containing the screw through the ceramic body to the lamp contact was by a small "rivet" which had worked loose, resulting in a bad connection at one rivet head. Cleaning and tightening the rivet is sort of possible, but replacement is much easier and better. But it made me look really closely at the new socket to be sure its rivets were tight!
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