My amp has been giving me loads of trouble lately. Basically, the input jack on my Bassman 100 (it's the older, 15" model) is very flaky. When I plug in the bass, it might make a noise, it might not. I can jiggle it around and it will crackle and pop for a bit, and eventually I'll hit a spot that allows me to hear myself play music. After anywhere from 3-15 minutes, it will crap out again. I opened it up to take a look at it, but it's firmly affixed to the circuit board and there are no apparent physical problems with it. I'm probably going to just up and replace the jack, but are there any other possible remedies? I've already doused it in contact cleaner, and my hope is starting to wane. Help!