SDG428P hotpoint gravity spin dryer?

a small washer load normally splits in to 2-3 when using this item. usually i only spin one wash load every couple of weeks when it's raining outside so it dries indoors quicker. yesterday i had two loads of washing & it split in to 4 loads for the spinner plus some items that didn't need spinning. on the fourth spin it smelt of burning motors. so just thought it wasn't happy with such a level of use. when i've come to it today it actually has stopped spinning. it's still making the sound of pump draining. my wash loads are small at around 4kgs a time & i've been careful to load it heavy items at the bottom. it is never spun over three minutes a go. any ideas what might need fixing?!