Bosch Classixx problem

I have had a Bosch Classixx dishwasher SGS55CO2GB for under four years.

Last year, I had a problem where the machine seemed to start and finish the programme but left dirty dishes. The sound of the running machine seemed to be continually interrupted by draining noises. When i opened the door midcycle the clock would add on a substantial amount of time to the cycle – then it would just go on until ‘1’ when it seemed to get stuck and i would have to manually turn it off. There was a very small amount of water in the bottom of the machine.

I thoroughly cleaned the machine. Took the filters out and checked nothing was blocking it and used a limescale product. This seemed to revive the machine – though I can’t say it has worked 100 per cent effectively since.

Now, the exact same problem has returned. I have done all of the above but it hasn’t fixed it. Am tempted to get a new one – but it doesn’t seem right to do this when it is just four years old. Have you any ideas what is wrong? Many thanks for your help