I've went down 3 times in the last 4 months since I started riding again. Twice at a stop, and once when making a slow, tight radius turn.
Then there was the 4th fall. Was feeling very comfortable with clipless, leaning to the left as I came to a stop and unclipping the left foot. But it would not unclip. I twisted and pulled on the left foot as I fell to the ground. After-fall inspection revealed I had lost one cleat bolt, and the remaining two bolts were way loose. Without the cleat firmly attached to the shoe, no way I could pull it out of the pedal.
Now I check my cleats before every ride.