boss, do not worry. i had this sound in my brand new 2016 model car and it lasted approx more than two years. i checked it with PS, my own mechanic, my suspension guy but they could not found any fault. not a single work was done in suspension.
it was a mild thak sound when u start car and drive in first gear. Some times it comes and sometimes it doesnt. but now its 4 years approx no sound.
the idiot Pak suzuki showrom senior mechanic inspected at that time and said it is a backlash pf gearbox and it will fade away.....mjhey to samjh he nahe ayee what he said.