I have an Ibanez GSR200 (active) and a Fender Rumble 100 V3 bass amp. At first it plays good, no problem, but then a static starts and it gets louder and louder and the heart-beat sound starts. First it's a slow tempo but then it speeds up until it can't go any faster and kinda sound continual and really fast paced. After a while it start's slowing down and eventually stops, but the sound of the bass is really bad after it. It's a lot more quiet and an awful quality. The problem goes away if I unplug the bass and plug back in but everything starts all over again after a minute or two. I suspect it's the cord because I bought a relatively cheap one. Any ideas?