Itsallaguess wrote:First thing to ask when something like this crops up is - has anything else changed?
Have you recently changed any light bulbs in the house, or light switches?
Any other wiring alterations at all recently?
Certainly sounds like something that involves electrical connections is playing up, or a connector block screw somewhere has loosened its grip, or something is arcing to the point of near-failure (but can still be restored by the jolt of a current from the nearby hall circuit). That bothers me, because where there's a dicky contact there might be heat and sparking sooner or later.
I am no kind of an electrician - by which I mean that I know how to replace sockets and suchlike, but I wouldn't know how to design a circuit, or dare to try! I would, however, start to examine a few bits for burning or deterioration. Starting with the bulb, the lamp pendant and rose, the room switch and the hall switch, in that order. Not to mention any old-style screw-in connector blocks, which in this case would presumably be in the roof space? Beyond that, I'd have a sparky in because I'd be well beyond my pay grade.
Having replaced a triple light switch in our hall, I've seen how crammed the wiring can get inside those boxes. I've also had the syndrome mentioned by didds, where residual damp in the plaster can cause tripping at the consumer unit. (Bungee Towers was a damp wreck when we originally bought it, but everything settled down as it dried out, exactly as our electrician had predicted.)
Final question: Are there any other things liked to the room lighting circuit? Extractor fans? Shaver sockets?
BJ