Wondering about your fore/aft seat position on the bike. I had problems like this early in the year until my instructor micro-adjusted one of the bikes to fit me. It took care of the problem immediately. Is this something you can check into with the help of your instructor?



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I teach Spinning and will say the knees could be the fore/aft position. Sometimes even if you are set up right (by yourself, and/or instructor) the seat slider can come slightly loose, and shift during a ride. Simply use your brake to stop your bike mid class, re-check it, and adjust / tighten to the correct position.
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