I have a ceiling fixture that uses three 40w candelabra-base bulbs. It was burning out bulbs frequently (about one per month). Over time, two sockets were not working (confirmed with a meter test) and I rewired the fixture with a three socket harness. After a few months, a bulb blew out and when I changed the bulb, found the socket wasn't working. Any thoughts on what could be causing this and how to fix?
By "meter test", I assume you mean a voltage reading from side to base contacts. By "rewired" I assume replaced?
Heat will expand the socket base. Pull the base tabs down to create a tighter contact. Using sandpaper, scuff the bulb ends that meet the contact. Bad connections create higher amperage draw, which yields more heat, thus burn-out.
Again, I'm assuming that all wires are connected internally and are very secure with proper wire nuts. Good luck.