The first fixture is being exposed to a voltage spike when the system turns on. Following a discussion on the problem, we find that many transformers are mounted too close to the first fixture and the closest fixture is connected within feet of it. Consider cabling to your farthest fixture and returning to the first (closest) fixture. We always recommend at least 30 feet of cable between the transformer and the first fixture.
Replacement of burned out bulbs is critical in low voltage systems since the voltage is distributed to the remaining lamps. This may produce premature failure in the remaining lamps.
Visit Replacement Parts & Bulbs to order replacement bulbs or LED lamps.