After about 30 minutes of playing i get a drop in bass power a drop in volume also a destorted sound occures during that period i tried changing the battery i still get the same problem i have a schecter studio 5 string dimond series thank you for your time

Have you checked that it is not the amp that is the problem? This is a fairly common thing to have the amp heat up and the thermal protection shut it down partly. Since the bass drops, a loose connection or bad guitar cable can cause that. If the signal becomes capacitively coupled only the treble will come through and be very distorted. Try a new cable. For the guitar, open the electronics area and look for loose or broken wire.