without seeing it I cant help but it sounds like suspension or motor mounts due to the fact that it happens intermittedly.
there are 3 motor mounts and even if they look intact they could be cracked and motor shifting. It only happes intermittedly because the motor shifts and stays in the new position.
Also check the main fron LCA bushing. THey are large rubber mounts just like motor mounts. Mine look pretty dry and I expect them to blow out some day.
third, check to make sure strut bolts are snug, unlikely but also take off wheel and inspect bolts on strut arms. two main bolts 21mm or something should be 100 ft lbs torque.
gl.
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