Yamaha TRBX 305 horrible hizzz! Help please...

Hey guys, nice to meeto you all, i am the new kid in town hoping to get some help from you...

A few days a go my bass just stared to hizzz in a terrible way, no matter what kind of cable i use it hiz a lot and it gest worts if i pop up the trebble control.

Dont know that to do, dont know why this happened my bass was just perfecto, please some help here.

Thanks a lot guys!

Rana.