touchpad scroll weirdness
 

After I've been using my laptop for a while, the scroll function on the touchpad will inexplicably stop working, while using it to control the arrow still works fine. If I stop using the touchpad for a while, a few minutes later it will work fine again. Restarting mthe computer works as well. It's more of an annoyance than anything but I would like to know what's causing it if anyone has any ideas.