cursor is jumping or jittering (don't know how to explain it) when i try to move it. did uninstall and re install and same thing.. called logitech and found out they discontinue the G7. bummer! and i ask the tech if there is any fix to it and he said no.. so he said he'll just send me a new G9.. anyone have experience this with their G7? i'm gonna miss that cordless mice..