Window electricals - not working properly all the time

[wsc]

I have a 1.2 16v 54-reg Clio.

For around 2 months now, the windows electricals haven't been working properly. The windows go up and down sometimes... and sometimes they don't. Is this common? I have owned the car for 14 months, nothing like this happened during that time until recently.

EDIT: Happens on the passenger and driver's windows simultaneously.

 

[corney]

Possibly a fault with the internal motor in the regulator unit-Renaults are common for this.
But try unplugging your door loom(big black block connector by door hinges) and look for any signs of corrosion on pins,If there is clean it off and spray some maintance spray on it and should sort it