When I purchased my new refrigerator 3 years ago, I also purchased a black box, about the size of a brick, to prevent voltage surges. The box is labeled 2500V. Recently, and several times a day, the box trips and the fridge stops operating. I reset the rocker switch on the box and all returns to normal, until the next time....might be hours or days. My question: is the CFE supply at fault, or my house wiring, or the box or the fridge? I can't figure out why this would suddenly become an issue, and only in the pantry. No electrical problems or tripped switches in the rest of the house. Any thoughts?