Laptop mouse getting a little jittery?

My internal mouse on my acer 5101awlmi (is that it? something like that) is all jittery going eextremelywhere and when im just trying to move it across it sometimes clicks on stuff and it never did this in the past. its not a year old yet and this occassionally happens. any tips? ive turned it off and on via the fn shortcut before you say anything
Answer
Buy anew one they are cheap