You've a small interlock module which receies inputs from gearshift,
ignition, and brake pedal switches.
Most problems I've seen are either a failed brake pedal switch or a bent
pin in the shifter that no longer contacts the park position switch.
First step-- check your brake lamps while the condition is occurring. If
they don't work, replace the switch. If they do, perhaps pull up the
console and nose around the shifter.
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