I have a problem of my chain dropping. What happens is when we stop and I unclip from the pedals, the crank rotates in reverse and the chain drops. I am in the large chain ring when this happens.
Could it be that my chain is too short and the tension from the derailleur is causing the crank to rotate in reverse. I have no problem changing into the lowest gear.
I have a larger chain rings on this bike what has resulted in me riding in the large chain ring and the large cog, cross chaining, or higher on the rear cog more often.