We often hear that the transformer is located too close to the first lamp, thus, the first fixture is being exposed to a voltage spike when the system turns on. 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 first fixture.
Replacement of burned out bulbs in a timely fashion is critical in low voltage systems since the remaining 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.