Gentlemen what you are all talking about is fine and I understand the mechanics of leveling off until receiving clearance to climb again and happens on most of the flights ive been on.
However as i've mentioned in my first post, what happened on GF236 wasn't just a normal leveling off then climb, it was a sudden throttle back followed by full thrust just 10 seconds later , and again a throttle back 5 seconds later and finnaly full thrust in also about 5 seconds later.
So it was a multitude of throttle ups and downs simultaneously after each other which had raised some eye brows from several of the passengers...