Well, you could try the one at a time method and see which
light is shorting to ground, if that is actually the nature of
the problem. (Plug the other ones into your two prong plug
with an extension cord temporarily while doing the gfci tests.
The circuit breaker should still protect you from problems
with those lights even without a grounded outlet. Keep a
fire extinguisher handy. Don't walk around on wet concrete
while testing. Wear rubber soled shoes. Etc.)
It is interesting that they may need to run for awhile before it
happens, meaning that the short is produced after something
heats up sufficiently, or that vibration in the home lets it
happen.
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