Plug cap arching
About 2 weeks ago I took a ride in the am before it got real hot out. On my way home,turning on to my road ,bike started missing,then shut off. I was still rolling,then the dash lights came back on so I let the clutch out to pop start it. Pop it did with a huge backfire,but I pulled in at home and shut it off. After it cooled I took the seat off to check the battery connections,sure enough,loose ground wire. I cleaned all battery connections. Bike fired up no problem. Here's my trouble. Next morning early,still dark I started my bike and in the dark I noticed the right rear spark plug cap arching out against the cooling fins. Last spring I noticed the same thing happenning so I bought a new NGK cap and wire and replaced it. The old cap had no cracks that I could see but changed it anyway. Now I notice the new one doing the same thing, I inspected it,gave the cap a little turn on the wire and even taped over the wire,boot and cap. Bike runs great,can feel no skips or misses,even had my brother in law listen as I left his house hard,letting up to 6k rpms in 2,3,4,he said sounded good and I was flying. It still arcs a little,but seems to stop after it warms up??Thought maybe the humidity???Should I just leave it and ride it.I don't want it to lead to some bigger problem.Thanks.