Long and short, whenever I squat heavier weight, I get pain in my left hip, and only my left hip, while doing the exercise. It lasts only for a minute or two at most, then it disappears. I can run, do leg presses and take a shit with no pain, its only when I am doing squats. I'm 28, no pre-existing injuries, and it only seems to be a problem when going over 280. I'm told my form is OK, so I'm not sure what could be causing this issue. Any thoughts, tips etc would be appreciated.