‘05 GX audio shuts down after less than 1 second

[Harley Rider]

‘05 GX with 147k miles, owned since new. Mark Levinson audio worked fine when I parked it three days ago. Now, it comes on for less than 1 Second, then shuts off. No sound on radio, CD, or tape (yes, the ‘05 still has a cassette deck). Turn the key off, then back on, audio comes on for less than 1 second, then quits again. Shut the GX off for an hour, same thing on start up. Nav screen works fine and all on-screen audio info shows up fine. Nav voice commands come through loud and clear. Searched the forum and can’t find anything.

Any ideas before I spend $$$ at Lexus?

[Harley Rider]

Update, Sunday, 5/6/18. It’s been parked inside since Thursday evening. Started it this morning and everything works fine. A resolved but unsolved mystery.