is it a memory loss on 2006 renault scenic?

On our 2006 renault scenic first of all the radio doesn't work (nothing at all) next day half of dash display stays illuminated when keyfob removed flattening battery.Removing battery lead recharging battery then all seems ok.Does removing battery lead let it sort its memory out.It did this last year at xmas and just done it again.Is it just a memory loss.
Regards Graham.

Graham Lowe
January 2010