I'm not sure if this is a common problem or one that is way out-there. I've noticed that my feet start to tingle in my cycling shoes about a half hour into my ride. At first, I thought it might be an adjustment issue with my bike. When I switched to clipless pedals I didn't readjust anything, but I wore the shoes to spin class today and the same thing happened. I don't think it's a sizing issue. The shoes are snug, but I can wiggle my toes...any ideas or suggestions?