Just trim the depower a little down (shortening frontlines a bit), just like one always does in really light wind.
It will cure this tendency
What you experience is most likely the "front line stretch" that goes on over time with ALL kitelines, and we all experience, so because of the higher load on the frontlines they get stretched a bit longer over time, and you have to trim the depower a little down (or change rear line knots) in order to have the kite behave like you are used to.
Simply pull the depower a bit more, and your kite will work as it used to
Peter