My ten month old sometimes cries when I change her diaper or dress her. I assume she would rather be playing or active rather than pinned down being changed, that's all! I remember this issue with my older daughter too, they're just wiggly and ready to run at that age and don't want to be held back!
My baby cries at naptime too, either because she's tired or because she'd rather be playing still too. But usually just for a few minutes. A sound machine has helped. Good luck!