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24 volt gas valve coils failing??

I'm a service tech and stumped on something. I have been on 4 service calls in the last 2 weeks and discovered all the 24 volt standing pilot gas valve coils have failed. other service techs in town also reported a small rash of failed coils on standing pilot valves. different locations, different brand furnaces, different brand gas valves. when i check transformers they give me at least 27 volt output. any ideas? install new gas valve and works fine.
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