A330
Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine
Situational Awareness
Aircraft Equipment Problem Critical
Flight Crew Overcame Equipment Problem
Aircraft
Upon level off at FL380 engines went from climb power to idle power and ignition came on; then recovered to climb power and back to idle again before recovering to climb power; accelerating back to .82 Mach and stabilizing at cruise power.Don't know why. No icing; light turbulence.
A330 Captain reported upon reaching cruise altitude both engines rolled back to idle thrust twice before resuming normal operation.