Bosch Logixx 9 Varioperfect washing machine sometimes stops during a programme

If the whole washing machine goes completely dead and silent then it's more likely to be the main PCB, but if it appears to work normally, but just the display shuts down then it could be an issue with the control module. But could it be some sort of design behaviour where the display just shuts down to supposedly save energy? I appreciate that it probably isn't as I would have thought you'd have noticed it before.

If it's the whole machine that seems to shut down, or if the display flickers as if it's got a power supply problem, the first thing I would do is plug the washing machine into a completely different wall socket (even if you have to temporarily use a 13 amp extension cable) just to make sure there isn't a problem with the wall socket. I had a very similar problem with my microwave where it just shut down part way through and it turned out to be an extremely loose neutral wire inside the wall socket.

Other than that it could be a connection problem, a broken wire problem or a dry joint somewhere. It can be difficult to track down something like this without access to spare parts to swap out and check.