Under cabinet lighting in kitchen?

Transformers keep burning out on all cabinet lighting. It's a 12v system with 12 volt 20 watt xenon bulbs installed in all them .There a total of 6 lighting units . Why are my transformers burning out . The power is 120 coming off all 6 fixtures . No voltage drop . 1 switch controls all lights in kitchen... show more Transformers keep burning out on all cabinet lighting.
It's a 12v system with 12 volt 20 watt xenon bulbs installed in all them .There a total of 6 lighting units . Why are my transformers burning out .
The power is 120 coming off all 6 fixtures . No voltage drop . 1 switch controls all lights in kitchen it appears that nothing else is on that circuit .
What am I overlooking ?
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