I noticed over the summer that when we unplugged the shore power, sometimes the main breaker would flip to the off position. No big deal. However, now that we are out of the water, it's damn cold and I want the boat to warm up, when I plug in my power cord 4 out of 5 times that breaker is off. I have to climb up the ladder, get inside and flip it on. So, it's not in overload position, it trips when the power goes off. I was telling the story over the weekend and one of the guys said it was "a sign" that the breaker was getting weak. True??