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Also, check for any voltage at all between
the neutral and ground at the suspect socket.
If you find more than a couple volts, that's
the problem. You'll probably need a good
electrician to figure it out and fix it.
The solution is to pull in a proper neutral
for every circuit.
The other possibility is that your utility
is giving you too high a voltage. But in
that case, you'd see lots of bulbs with the
same problem, as would your neighbors.
1) Before doing all the checking suggested in the previous post check this: Are you using the proper wattage? Inside the can is a label that will tell you the maximum wattage. If you exceed this you will shorten the life of the bulb and are risking a fire.
There may be several wattages listed. It depends on the insert. If in doubt, try a lower watt bulb.
2) Another possibility is that you are using halogen bulbs and the fixture is getting too hot. When cans get too hot, they shut off until they cool down. You may be seeing it at this shut-down phase.
3) According to your figures, you get about 7 weeks per bulb. At 24 hours/day thats around 1200 hours. Many incadescent bulbs are good for 700-1000 or so hours. Try a different brand, ie) a long-life bulb rated for 2000 or more hours.