How can i fix my radio in my 2003 clio?

Hi there, my radio has stopped turning itself on and off with the ignition. It also 'times' itself out when in use, almost like its not registered that the engine is on???
My partner has checked the fuses, do you know what else could be causing the problem??
It was fine one second and then turned off whilst in use and driving, and hasnt worked properly since...
My car is a 2003 renault clio expression