How to fix loose connection in downlights ?

I have kitchen downlights , one of which comes on/ off as it pleases,
On investigation, the 2 wires that connect to the small ceramic piece that the 2 pin halogen slots into, one wire appears loose,but I can't see how I would tighten this up. There are 2 tiny screws right next to where the wires are,but they don't connect to the wires,does the whole fitting need replacing.?