Bosch condenser t/dryer WTE84307GB/13

Hi. God I hate these contraptions! What follows is tested with a load and is retested with a water spray bottle to re-wet to retest the load so it remains moist whilst testing 2nd / 3rd times.
Set a just spun load in t/dryer on Super Quick 40 minutes and this is what happens: will start but then fail maybe after 5 minute or 20 minutes. No fault codes, only light that is flashing is the start button light. If this button is touched sometimes it`ll restart sometimes you have to open the door and close it then it will. Noticed when it runs up to 20 minutes or even beyond it gets very hot I also have noticed that when it stops to go anti-clockwise it doesn`t and continues in a clockwise direction which may well be 1) why it gets too hot and then 2) stops. So we have 2 consequences of one fault.
I did change to bottom front near the filter ntc temp probe in the early days of fooling around with this thing but that made no difference because at that time I had not cottoned on to the non reversing of the drum.

I presume the drum is supposed to reverse??

So do you think it is the pcboard ?

Things noted: the water pump pumps and the water does get into the water container so that isn`t an issue. Filter is clear. did try the white vinegar trick on the thin metal sensor bar things. No blockages anywhere as far as I can find. On digital display count down 40 minutes runs sometimes down to 34 skips to 7 minutes ten count down and the odd skip to 0 without any cool down period. Any pointers please.