When I run the hot water to the bathroom sink, as soon as the water starts to heat up, the tap just stops, and I have to give the top bit a few more turns to get it flowing again. It will then usually stop a couple more times, and I find I have to switch it off then back on again to get it flowing again. Happens every time, but only this tap - the bath tub and the shower, both in the same room, are fine.
I've got a fairly new combi boiler (3 yrs), which is maybe 3 or 4 meters from the problem tap (in another room). The pipes going to the basin are a little wobbly, I'm thinking about zip tying them together to make them more stable.
Any ideas on what could cause this?