Hello, I was flying from KSFO to KSAN in the A320. When i reached cruise, the throttle kept increasing and decreasing all the time and it is VERY annoying. The speed (kts) was staying where it should be but the throttle was going up and down. (not the actual throttle, but the one you can see on the ECIAS or something. The levers were still on climb thrust) Does anyone know why this happens or how to overcome it? Thanks in advance.