what is the fault with my washig machine? bosch maxx 5 serial no waa24161gb?

bosch washing machine. model maxx 5. serial no waa24161gb. the rinse/spin cycle not working, the rinse & spin lights flashing indicating a fault. stripped down filter, checked, cleaned. checked inlet & outlet for blockages.
checked pump for freeness-ok. machine works for 2-3 times, then fault reoccurs. repeated same procedure 3 times now. machine works then same fault occurs after 2-3 washes.??? i am baffled.can you help?

alvin yeovil
August 2009