I do a lot of work in a venue that has 'well used' equipment. We have two styles of EDI dimmer racks. One that uses pin plugs, and one that used edison. We plug our circuits directly into the dimmers. Tonight I was setting up our next show, and discovered not one but two melted male connectors. One a pin plug, one an edison plug. The pin plug seems to have fused itself to the female in the panel, and then generated enough heat to destroy the plastic of the male pin plug. The edison plug had gotten hot enough to melt the plastic holding the male blade in place ( leaving a nice round hole). This is the first time in over 30 shows in this facility that I have ever had a plug fail in this way. Two in one show makes me think there may be something systemic going on. The pin plug had 1250 watts plugged into it. I am not sure what the Edison had, but the max possible would have been 1500. Any ideas what could be going on to cause this rash of failures - and what I might be able to do about it to fix it? Thanks in advance.