Ive had that problem with my old car. its the grooves on the freeway and the thread of the tires, the stock tires have alot of weird angle and line thread. So they our tires hit the grooves on the freeway, it shift. I dont know if you get what i mean.. the freeway is straight line and our tires if diagonal and rubber is soft and its suck. Change tires and you will see the difference
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