yes that's what I did,(first question) It happened twice while riding this morning and twice last Sunday. I changed the freewheel and chain, the same teeth as before. I didn't make any changes to the front chain rings. The RD itself is shifting fine,only time the problem arises is when shifting down to the small chain ring up front. I made sure the chain was the same length as before. It never did this before with the old freewheel/chain