Once in a while I'm a little off balance, my left (slide) foot is too far left (or no slide/stick) and I wind up stepping back and right with my right (push) foot. It's not often (once per dozen games or so) and I usually get my strike or a reasonable leave. It could be I need to work on my foot work -or- maybe just a plane old age issue... I almost don't care as it's low noise level for me.

There is a guy on my Monday league that hops every ball. He has a 200 average and I haven't watched that close but I assume it's what works for him.