Griffon Autorun Interaction

While flying with the griffon, pressing the space button(which is the button that wing flap is assigned to) will sometimes cause autorun to turn off. I've been unable to reliably reproduce this bug. The best way to reproduce it is to start flying from a high place, toggle autorun, and flap your wings whenever possible. Eventually, you will find yourself rapidly losing altitude while only coasting off of momentum. Toggling autorun again restores forward movement. I've had this happen in maps from the base game as well as PoF. Since obtaining my griffon, it has happened consistently across all of my characters. I don't group frequently, so I'm not sure if that has an effect. I would assume it doesn't, but assumptions have little merit.If I can provide anything else, please let me know! =)