It sounds as though a previous occupant has done this
for some reason that may be clear there but not here at this stage
. Possibly to add further extensions more easily.
It would be useful if you could see if further extensions are run off the back of the NTE5 faceplate, as in this pic
There is a high probability that there are now two master sockets on the line. That is not recommended, but seems to be ignored on that page.
I suggest you check what the connections look like. If they are badly fitted then that could be the cause. Has she been there with it OK for a while, or is this how it has always been - unreliable?
If it used to be OK it is more likely an external fault has developed. So let us know the answers to the questions, as there are two completely different tracks to consider.
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