How do i stop my dishwasher from going all the time?

my proline slimline silver dishwasher has been fine for a year and what do u know 1 day after warranty runs out it goes nuts!
can any one help. i set it on the normal wash dial and when i came down in the morning it had only gone on all night and was only a third through the cycle. they r still getting washed but im having to rinse them myself but it just keeps washing and dosent go round the dial? any ideas