Recently the bridge pickup on my fender jaguar is sounding too low, volume wise. what can i do to fix it?

I also have another problem, the fender jaguar has two independent circuits, one wich is only assigned to the neck pickup (circuit 1) and the other can be configured as i like it (circuit 2).

I found out that if i have the neck pickup sellected in the circuit 1 there's no feedback, and if i have the same pickup sellected on circuit 2, there's haching feedback. can this feedback problem be also related with my proco rat distortion pedal?

help apreciated
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