Remove the control cavity cover. If it doesn't already have it, put some copper shielding tape on the inside of the cover (aluminum tape will also work). If it already has copper tape on the bottom side of the cover make sure it is contacting the grounding tape inside the cavity. If there is no grounding tape inside the cavity then locate the small black wire that grounds the bridge (it's much smaller than the pickup wires and should be the only other wire entering your control cavity from a hole in the body of the bass).I've had my Epi for about 3 years, and I remember kind of noticing it for the first few months but not thinking much about it (I used to be much less committed to learning and practicing). Then after my band was more active, I got more into it and as I stood more and moved around it became more of an issue. Me and my dad looked at it inside and out but could not figure it out, so I just settled for the sponge, which has so far worked pretty well. So I wouldn't say it's resolved, more that it's just not as much of an issue now.
Once you've located that wire, gently strip off a bit of the insulation near where the wire enters the cavity from the body. Now install a strip of grounding tape up the side of the control cavity and onto the recessed ledge where the control cover sits. Be sure to install that strip of tape such that the bare part of the bridge ground wire is firmly contacting the tape at one end and in good contact with the underside of the foil covered control plate at the other end.
If you do all that and have good contact everywhere your bass will be grounded from static buildup whenever it's plugged in.
Good luck, and remove that sponge.
Edit: I got distracted with some antics here at home after I started this post. After I finished and posted I noticed your pictures and Chuckys comments as well. Chucky is spot on. You have a wonderfully shielded cavity cover that unfortunately isn't grounded to anything. Static can build up and cause noise in those situations. Follow either my post or Chuckys direction and you should be good as gold.
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