Power Fault Dash Lights Speedo etc Clio 1.2

[Mattd]

Hi all i have a 52 Plate Clio 1.2.
I have a problem with the dash light & speedo.
Every so often the dash lights, speedo, Radio goes off whilst driving.
I have checked the obvious the Battery is connected correct & it seems to be fine.
Car still runs as normal when the power goes off so dont really know what to do??
Any ideas id be so greatfull.

Thanks
Matt