I have a 2016 bmw 435I grandcoupe xdrive, I recently replaced the front struts and front axles of my car. prior to this my car made loud bangs or really hard knock when I went over podholes ( its like the whole frame of the car or the front of the car body just slams, cant really explain). my mechanic told me that the sway bars and control arms were good when he finished installing the struts and axle, after that my car still makes this loud bangs over pod holes. someone help me please.