OP - been hitting any pot holes lately? Had super low tire pressures? Running cheap tires with tons of sidewall flex? Or are there wear marks where the strut slides in to the steering knuckle indicating that the strut has been moving vertically?
Likely that the strut has slipped down in the wheel carrier. There is a tab on the back side of the strut that keeps it from being installed to low, but the tab is easily bent with a hard impact or jacking up the control arm with the clamping bolt loose.