well I have seen stories about the motor used on these later modules and its all bad. Hotpoint as a make is a load of junk these days in my opinion but most other makes have lowered quality to reduce cost as well
if it is the motor, motor cost about £120 which means the cheapest way is to claim on the 5 years parts warranty and get hotpoint to fit it . Or scrap it
you also said you paid extra well cant see what for as its the same motor, case and basic works as every other model
Dave