Bosch washing machine extending cycle at spin time

[Mmr]

Hi bit of a strange one I’ve noticed the washing machine (Bosch WAQ22461GB) adds 45 minutes to the cycle normally right at the end at around spin time (it occasionally happens at other times).  The only solution is to stop that cycle and do a spin only cycle which works as expected.
From comments on here I can see a heat element issue, the door gets nice and warm at 90 but does not really change temp at 30, so is this a heating issue or a dreaded PCB issue?

Edited November 16, 2019 by Mmr

[Whitegoodshelp (Andy)]

I wouldn't be surprised if the door doesn't get warm at 30 degrees which isn't very hot at all. A heating element will normally either work or not, it's unusual for it to work sometimes and not others. You would have to test the element for connection faults and for continuity to be able to eliminate it. This article should be of interest Washing machine not heating up water

[Mmr]

Definitely is heating water up.  About 7 minutes before the end it makes a noise and cycles goes up to 49 minutes.  I’m running out of ideas!