Your battery could be on the way out. Best thing is to get your car to a garage that can plug in a diagnostic to your car's computer. This will tell you what's wrong.
your instrument cluster is probably faulty - this is a known Stilo issue.
I can repair it for you but you would have to send it to the Netherlands - same day repair, shipping time 3-4 working days.
It's possible to drive without the cluster, best to use a satnav for speed control temporarily.
Further info on PM please....