Just a thought....
What do the blades on the plug look like once you get them out?
Any evidence of arcing (such as pitting, discolouration etc).
I'm thinking the contacts inside the sockets could be getting dirty(dusty, corroded) and causing a bad connection and (arc) "welding" the blades to the contact. Could be worse if your trying to suck a larger amount of power through them like for a fridge.
maybe try cleaning the contacts and blades
Stevo


				
				
				
					
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