#1
Ok it started at my last gig. I started to jumping during a song and my amp started crackling and popping, cutting in and out. I had to turn off the amp for it to stop. The cables are fine because I tested them later on a different amp. I cleaned the input/output for both amp and bass and also tightened my bass output but it still happens when I jump up and down. What could be the problem?
#2
It could be a bad cable, or more likely it is a not-so-tight connection between the plug on the cable and (a.) the guitar output jack, (b.) the amp input jack, or (c.) both jacks. Make sure you have good spring tension on the metal piece that contacts the tip of the plug.
"Maybe this world is another planet's hell?" - Aldous Huxley
#4
Could be some dodgy solder begind your guitar jack or your amps jacks.
Gear:

Gibson 2005 Les Paul Standard
Fender Road Worn Strat w/ Noiseless pickups
Marshall JCM 2000 401C
Marshall Vintage Modern 2266
Marshall 1960A cab (Dave Hill from Slade's old cab)
Ibanez TS9DX
EHX Little Big Muff
Freshman Acoustic