My no crank issue was caused by a fault inside the trans - computer was reading the trans was not in Park & not allowing the car to crank. (blocking the relay signal ) Same exact symptoms: it would start fine sometimes and others i'd get a no crank, no click nothing. A telltale sign, there is a peculiar readout on the PRND21 display, I believe when I got the no crank, there would be a box displayed individually around each character. Eventually it progressively got worse until it would never crank. After much, much, much diagnosis and parts throwing, I bypassed the relay and installed a push button start on the dash. The push button start bypass worked until I had to replace the transmission two years later and was able to use the key to start after that. It has been a few years so the details are not fresh.