Is my mouse (computer peripheral) messing with me, and if so, how?

I have a synaptics touchpad mouse for a Dell E1505 laptop. Every so often, when I watch a Youtube video, for example, my scroll function will not work. However, when I do a few searches on Google for various things, it will. Yet, not on the first try. But, always (whether I search first or a few searches later) when I search for “scroll mouse not working”, it instantly starts to allow me to scroll. WTH?? Anybody else experience this?