Weird Wireless Mighty Mouse Behavior

I've had my wireless Mighty Mouse (as well as my MacBook) for 6 days now. I'm noticing that my mighty mouse does fine scrolling down and side-to-side but struggles to scroll up a page. It seems to get stuck and jump up any page. Any solutions?

time to clean the scrollball (six days old is a concern). search the forum for tips and suggestions for how-to.

if you have been using the MM in a sterile clean room, and it can't possibly have a piece of fluff inside, try applying more pressure on the scrollball as you scroll up.