When you have not been in the seat of an aircraft in a hot minute, perhaps those first few flights you are flying by "feel" and not by "memory". By that I mean by feeling what the plane is telling you as the fight progression runs you through your paces. After a few flights your brain has a muscle memory of moves, speeds, everything you "use to do" and those all start coming back.
Bad habits you didn't know you had or you could push the envelope of the aircraft in ways you previously had not?