My in laws' kitchen has worktop lights with 12v 20w g4 lamps in them. They tend to get used a lot because there's not much natural light, but every time we visit (most weekends) I end up having to sort out one or two "failed" bulbs. The bulbs haven't usually blown, but they suffer from bad connections in the fitting. Usually, holding the lamp with a cloth and working it in the socket scrubs the connections clean and all is OK again for a couple of days. I suspect that the pins run so hot that they, or the contacts in the fitting, oxidise and break the connection. Does anyone know of a fix for this problem?