If your footjoint has felt overly tight or "sticky" lately, the connection point, also known as the "tenon," may be dirty. Use alcohol and a cotton swab to gently clean both ends of the tenon. When cleaning the footjoint (receptor) end, be sure to keep alcohol away from your D# pad on the inside. Wipe off any excess alcohol on the tenon with a clean cotton or microfiber cloth before reassembling your flute.
CAUTION: Never use any oil or grease (such as cork grease) on the tenon. If your footjoint is so loose that it is constantly falling off, see a repair technician to reset the connection.