My husband recently had a weird problem where he couldn't release his cleat from one of his M-324 pedals. He eventually had to remove his foot from his shoe to get off the bike! Even then he had a difficult time releasing the shoe/cleat from the pedal. When he did he noticed that one of the screws holding the cleat in place was missing. He inserted another screw and made sure everything was tight before riding again. Today, after several trouble-free rides, he had a simulataneous malfunction on BOTH pedals - this was at the end of a 45 mile ride where he clipped/unclipped without any problem several times. Anyway, he eventually freed one shoe from the pedal, untied the other shoe, and removed his foot from the shoe (again). The shoe is still on the pedal . . .but it's spinning - the cleat is loose.
He has a new pair of shoes, fresh cleats, and, if needed, another pedal set and may just start new with all 3 parts of this equation. The question is really this . . . has anyone ever had anything like this happen to them, and, if so, was it a pedal problem, a cleat problem, or a shoe problem.