Was the Airbus A320 Recall Caused By Cosmic Rays?

What triggered that Airbus emergency software recall? The BBC reports that Airbus's initial investigation into an aircraft's sudden drop in altitude linked it "to a malfunction in one of the aircraft's computers that controls moving parts on the aircraft's wings and tail." But that malfunction "seems to have been triggered by cosmic radiation bombarding the Earth on the day of the flight..."
The BBC believes radiation from space "could become a growing problem as ever more microchips run our liv