hi everyone, im kinda new to the electronics of the bass. recently something happened to my bass. one of the knobs which adjust the tone kinda got really loose. i try tightening it but it got loose again its asthough something broke. on top of that it has stopped producing sounds but sometimes it does if the knob is stuck but when i move a little the sounds just stop producing. can someone help me to explain what has happen and i will appreciate suggestions on what should i do.. thank you 
