I am experiencing a very similar problem. My 9506 machine fills with water then the drum turns intermittently. I have found that lightly banging the washing machine below the door brings the machine back to life and the drum turns. However, this does not offer a permanent solution and the drum after a while again stops turning.
My own feeling is that the problem is linked to the motor / brushes or a linking gear mechanism either worn or faulty.
Sorry I cannot offer any real technical help.
Martin
June 2010