Hi there, just had the same problem with my dash in December. Started with the dash going off and flickering, it then added 5000 miles on its own!!!
Check with Renault as they might replace you dash for £150
I chose to take the dash cluster out and opened the case to find a dry joint to the left of te grey connector. Resold erred this but after a few week the dash went completely dead. I send it of to ics in London Derry. If you need to send it off speak to Ian at ics on 02871 301023 he's really helpful and they offer a 5 year warranty
Scott
February 2013