My indesit WG1432 machine will very rarely reach the highest spin speed. The rest of the cycle works fine, and it will spin but only very slowly. Sometimes it will rev up as if to into the high spin and then not make it other times it will make it. It may be be related to the weight of the wash, but my wash sizes are never enormous. What can I do – is it a fixable fault and worth fixing on this 10 year old machine?