Kenwood Multione KHH30 speed fault

I have an intermittent fault with my mixer. I only use it about twice a month, but sometimes when I turn the speed control on to the first, slowest speed, it starts off on the maximum speed for a second then cuts out. You then have to turn the mixer off at the mains to reset set it and try again. Sometimes it will then work as normal, other times it will go onto this maximum speed routine for a few times before it works normally.

I see from Google searches other people have had this issue. But no one has said what the problem is, or if it was repaired.

Please could someone help me and tell me what's wrong and what needs to be done to fix the problem?  Thanks

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