WFO2865GB/01 STUCK ON WASH CYCLE

Hello
as above, WFO2865gb/01 Bosch Exxcel 1400 Express has started getting stuck in the wash cycle… doesn’t rinse or drain , unless manually selected when its fine…

I have recently cleaned out the drain, as we have to do this periodically anyway, but having searched the WFO posts I’m off to do this again 😉

counter carries on counting down to 1min, but doesn’t stop, just keeps washing, and causing more bubbles lol, so that rinse /spin doesn’t really get rid of the bubbles very well.
spin , when it’s allowed to…works fine, and I believe rinse/drain is ok too(I don’t profess to ‘know’ the timings 😉 )

I can hear the pump working and the water gurgling out but any pointers while I’m checking the Filter would be appreciated 😀

Cheersedit:- a little more info

slung a teatowel in for a freshen/spin
and the drain pump (which dosent have excessive play and ‘jumps’ around as it should by hand…)
ran for 40-60 secs

Filled rinsed then
took 165 secs before a clic when draining, a further 20-30 secs then the drain pump stopped and another pump noise started at approx 9mins remaining, and the spin cycle started.

I have started it on a 90 min wash now, but I did clear some solid powder deposits from the black tube into the pump filter(which would have been restricting the throughput)
also can anyone tell me if the ‘ball’ in this draining tube (approx 2-3″) is some sort of float?
and if so could this affect the wash cycle not ending?
I scrunched the rubber around the ball, and it seemed to break up similar deosits in the pipe…

on starting the above rinse cycle the deposits clattered around the pump for the first few secs…(Couldn’t get to them without removing the whole drain inlet pipework)

from other posts it seems the poor or inefficient pump gives the symptoms I’m experiancing, but can someone tell me why?
for an intelligent machine, that adjusts timings if out of balance etc it seems a little odd that it would continue to countdown, when it hasnt completed part of its cycle??

Sorry for the essay… I’m an elec/mech engineer so I like to know ‘why’ lol