1997 Buick Lesabre, No start, No crank, No click, No dash lights

This has happened a few times, initially turned off while driving. No instrument
lights, no engine cranking, dashboard totally dead. It came back to life
randomly about a minute later. 3 times now I have not been able to start it
without doing some random jimmy-ing of some wiring and relays under the
hood (not really sure if it fixed the problem but it did eventually start).
Sometimes all the instrument lights come on then go off to start with. Overall
problem: I put the key in no lights come on, no engine cranking. The battery is
great. Any ideas? Thanks!