well there is a service bullitin on this so its a know problem
it involves changing one of the user interfaces ( which ever is causing the problem)
it gives part no 480121102685 (C00314591) for the part
can only find it on ebay at £130 and there are 2 of them in the unit and either or both might be causing your problem
At 2 years old I would talk to hotpoint as i would veiw this as a manufacturing fault but not sure of their interpretation
if not you may be able to go at the retailer under sales of goods act
Dave