I have got a renualt clio extreme 1.2 16v 2005 year. When i got it few week later it started to give me problem which was the drivers side window. When i drve the window use 2 go down it self without me holding the switch, after abit it goes up it self. I took it to the garage and they keep on sayin it fine we dnt no wat the probblem is. I got a feeling it got be the relay which im not 100per cent sure on, WAT DO U THINK DO IT BE!!!

When it is the relay either it does not work, or get stuck half of the way, working erratically.
I do not think the relay can cause the window to go down automatically by itself.

It looks more like a contact either on the window wiring , or on the window switch, the wirings must be tested, starting from switch side, and ending on window side behind the panel.
At some point there must be a contact that with car vibration triggers the window motor.