The retailer is responsible for remedying any problem which arises, due to an inherent fault, for 6 years from the date of purchase. (An 'inherent fault' is something which was already wrong with the machine when it was purchased, such as the use of poor quality materials).
For the first six months of that period there's an automatic assumption (unless there's clear evidence to the contrary) that any problem which occurs is due to an inherent fault. (Thereafter it's up to the customer to prove that it was the most likely cause)..
Contact the store and insist that they remedy the problem. You have the right to receive either a repair or a replacement (but not a refund). You can indicate which of those two options you'd prefer but the store is entitled to substitute the other option on the grounds of economic viability.
Chris