2 times on freeway and 1 time on city streets, no vehicles within 100 yards and vehicle came to complete random stop. On freeway, tires skidded it was so abrupt and had neck pains for a few days thereafter. One time also on city street, corrective steering pulled shaply to right almost causing accident. Called hyundai and the representative had no advice or care to even intake the issue for records.not a safe vehicle especially since the engine has already failed and the ac has been replaced. It's now a frankenstein death trap being a danger to myself and others but they do not care.