wow ur not the only one this has happened to me many times: cars random-jumping everywhere, and then stopping suddenly and blocking me but that only happened when my ping was like over 300. what i did is just waited for it to be normal again lol, but it took like 1 day not months like ur case :S also ive had other problem, when my ping is okay (~200) but the downloads are slow as FUCK, ex: when i pickup a nitro it appears like 20 seconds after xD what i did there was to reset my modem/internet cable and reboot my pc and it was fixed