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Went completely dead at traffic light

Not the first time, but today after 30 mile highway trip, mild temperatures, while waiting at a red light, the car went dead - no lights, no engine.

I turned the key off and back on - nothing
Second time key off/on it stumbled back to life.

Dash information had reset:

Average speed
Average fuel consumption
Trip odometer
Clock

All set to zero or blank.

I've checked the battery connections in trunk and under hood - all are clean, dry, and tight.
Checked the ECU ground under hood and it is clean and tight also.

Suggestions anyone?

—A