erratic mouse and curser on macbook?

Welcome to Apple Support Communities.

Dirt and debris lodged beside or under the keys, button switches, and trackpad can cause erratic operation. Or the battery may be swelling and distorting the trackpad and/or keyboard. It depends upon the model.

If you have a MacBook with a removable battery, shut down your Mac, remove the battery, reconnect the power adapter, turn the computer on, login, and see if the erratic mouse and cursor problem goes away. If the problem goes away, your battery is likely swelling. If the battery is swelling, it needs to be replaced.

kostby,

That was a useless reply. My retina MBP is brand new and there is an erratic mouse problem. It is a software issue. Please research a solution.

Thanks,

Hi lizpac7

Could you provide us with any aditional information? Based on what you have told me I would think that there is some 'GUNk' Lodged into your keys or your trackpad. It could be the mother board which is a costly fix or as osso_Buco said it could just be a software. To further help you we would need more information.