Hello everyone, my name is John this is my first post. I am hoping someone might be able to help me out. I have a Fender Rumble 25 practice amp, an Ibanez GRS200 bass, and I just bought a new Fender instrument cable. I replaced the battery in my bass and yet I am having sound issues. My amp powers up just fine if I play something through the auxiliary input everything is fine. However when I plug in my bass and try to play is will sound distorted like then nothing hit the strings some more it will play fine tjen go out. Kinda of back and forth then if I unplug the bass with the amp on and plug it back in it will work momentarily then start fading out to nothing. I have pulled the amp apart and checked the connections inside everything seems fine. I checked the input plug it's tight and doesn't seem dirty or corroded. The amp is more than a few years old but has barely been used since my old bass developed some serious issues and became basically unable to use. My new bass is a little over a year old that is why I replaced the battery. Due to injuries I haven't been able to play it since I got it. Just bought a brand new Fender instrument cable thinking my other cables which are about 30 years old were the cause of the issue. Unfortunately the issue remains. Any help anyone can offer would be greatly appreciated. I am trying to start my bass journey all over again, the right way this time. Thanks in advance I can't wait to get to know you all and learn and enjoy music together!