Hi, wondering if anyone can help, during the summer i noticed a very gradual lowering of the string height, in the last three weeks the problem has accelerated, now the strings are maybe three or four millimeters above the end of the fingerboard, my bass is old carved, lots of cracks and splits,all taped up, i have correlli 370 mediums on, five years old, played alot, can strings stretch so much that this can happen? or is the problem more horrible..she is in a pretty bad way.