BigB,
I had a similar problem. UF cable that over the years got deteriated. I hooked up a FLUKE 87 with the MIN/MAX mode on then i noticed that the MAX would register very high current draw then the breaker would trip. Then tried it again after about 5 minutes it registered some high current flow then the breaker tripped. I came to the conclusion that the UF cable was damaged somewhere between the house and the BBQ pit.
Thought this might help.
EDWARD
