Got an "04 FX 35 AWD w/176,000+ on the ODO. Recently, particularly once I get to cruising speed it feels as though I have a flat spot on a tire, a tire is going flat or there is a warped rotor. Sometimes it is worse than others including when I am slowing to a stop but I don't have to be pressing on the brake pedal for it to happen. Many times once I take back off from a full stop the issue doesn't happen again. Other times it drives fine. I'm no mechanic so I am asking for any advice. Thanks!