Club Car DS golf cart starts no problems, runs great, except when going along it "bogs down" loses power and runs slow. After a few minutes, it picks back up as if nothing is wrong and is back to normal. This has been going on for a while now. I recently noticed that at night with the headlights on, the lights brighten when the cart slows down, goes back to normal when the cart speeds back up. Any help would surely be appreciated!