Vehicle was running great, pulled in to a stop, turned it off, won't crank.

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Replaced 3 starters, all cables, ECM and Ignition and steering lock sent to SOS shop, all checked ok. New battery, still no crank. Please help. Vehicle's done this before, but always started sometimes in ten minutes, sometimes in 2 to 3 days. Been over month now, no dealers within 243 miles.