Nothing would surprise me about the wiring in this house - bit of a dog's breakfast. Having said that though, it has worked OK for the last 20 years. The RCD problem only started a few weeks ago and, as I said, has been completely sporadic. I have read that UPS devices can cause RCD trips. We have two of these. One protects my modem and router and the other protects the rest of my computer equipment. The one on the modem and router did get replaced a few weeks ago - I can't remember the exact dates - so I wonder if this could be the culprit?
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