Wow. What a range of advice, from total rubbish, to very good.
My advice is this: read the posts by twisterfencing, MrBiggs, Keith and D'Art, and ignore Extreme-D, Terilsson and mifencer (although the latter makes a valid point, just probably not relevant here).
In particular, Extreme-D's advice to buy a new weapon is just rubbish. Unless a blade is broken there are no electrical foil problems that can't be solved with a rewire and replacement of (some, or all of) barrel, tip, grub screws, spring or socket.
Some blades get so soft that you wonder whether its worth it, but thats a different issue.
Bearing in mind the info available, I would clean the tip and barrel, and test the continuity with a meter. (tip contact to bare wire at socket end, including the bending of the foible as described.) Replace the screws and spring anyway - its cheap and even if it doesn't help with this problem, it may prevent a new problem from occuring in the near future. Then re-assemble and test with bending the foible again and twisting the tip. I just have a feeling that the contact is not properly attached to the wire, maybe in one case, maybe in both - sometimes these can be ok for weeks and weeks, and then flare up.
If you have to re-wire, and don't know how - ask the person who does it to show you. Its easy, once you know how.
Regards
Baldric
PS - The comments about LP bayonets above are quite true. Buy the real thing, not a copy. It also helps to use an LP bodywire (or bodycord as you colonials say
) Some other manufacturers bodywire bayonets dont seem to marry happily with genuine LP sockets.
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