The wiring in my house is old (about 50 years old, mostly).
Over the last few months, the earth leakage has started tripping a lot. Not a consistent socket, but a bunch of them (though a fairly consistent set of them).
Generally happens when a high-draw appliance is being used (iron, tumble-dryer, oven, etc), though those appliances themselves are all plugged into very different sockets, on different circuits.
So my question is: Can an earth leakage “degrade”? ie, is it likely that the earth leakage has just become too sensitive, or is it something else?
A pic of the earth leakage on the DB: