go into the diagnostics and check the error codes (if you have access to the maintenace menu's. Error history should reveal the last error if it is a stored code.
let me ask, when you are driving can you hear any clicking coming from the drive motor while driving? (kinda like cards in the spokes of a bicycle wheel sorta sound?)
This is ONLY to be used to report flooding, spam, advertising and problematic (harassing, abusive or crude) posts.