I didn't think my powerwizard p1000 was hitting hard enough. It was getting 3k volts at the beginning, but over time the voltage continued to drop. When it dropped down to 1.4kv, I decided to make a change. I walked the fence and noticed no obvious grounding issues. I then purchased a Parmak super energizer 5. It worked good for about 4 minutes, then started tripping the gfci. Is it the box or the power source? Please advise.