Sillyoldman
Guru
Har har
Could be something along these lines. Last winter I had a click per pedal revolution that once it started on my ride it did not go away. It was always from the right side. It would start at varying distance into the ride. What did it turn out to be? Well, I was wearing cheapo overshoes and at some point into the ride one of the velcro fastening tabs popped open and then clipped the chain stay on each pedal stroke. Almost sent me nuts before I found the cause.