Tricity Bnedix CAW100 -- Jumping and sneezing?

The machine has started to exhibit a strange characteristic.
It washes fine and does all cycle correctly but it is now punctuated with "sneezzes". It sits there quietly and for now apparent reason wants to let in water topup and at the same time go to max spin speed. This all lasts for a spit second only and teh reult is that it sounds like a large sneeze and the machine tries to jump out of its location very abrubptly.
All returns to normal and then it will do it again -- perhaps a dozen times in the cycle.
What part has failed ??? Can I fix it??
thanks