The last time we camped, my shore-line twist lock (the end that plugs into the camper) didn't want to let go. It took a bit of tug on it to get it to come out of the receptacle. It was late and kinda dark, and I didn't give it too much of a thought. I just coiled up the cord, tossed it in the compartment and went on about my business.
Go to plug it in on Saturday morning, and no power in the camper. Unless I wiggled the cord just right.
I pulled the plug back out and upon inspection saw that one connecter was melted down.
. Looks like it might have been a bit loose, and the heat build-up melted the housing. No signs of arcing at all. Funny thing is we never had a power issue at all the weekend it melted. That forced me to buzz about 30 miles up the road to a home depot to see if I could find a 110volt 30A twist-lock plug. Turns out they had one (JUST one!). It was nearly $40, and cost me half of the morning to go get it, change it out and get the power on.
Learn from my experience folks! if your plug does not go in or come out just as easy as it usually does, spend a minute and find out why. That goes for both ends. In fact, it's now my SOP to give each end a visual inspection before plugging in and after pulling out. What would have been an easy fix one evening at home wound up costing me valuable lake time.