I fixed mine my self and was proud to have done so, the machine now runs perfectly after changing the motherboard it took me 10minutes and was super easy to do, just remember to disconect from the power before opening the top, a 300 € fix would not be economic it would have been better to buy a new machine.
https://www.ebay.co.uk/itm/Many-Parts-For-Washing-machine-Samsung-ecobubble-WF70F5E0W4W-EU/333503835... i found it on e bay using the model number which is on the door
That sounds like a good idea that I may have to follow as I have only had my Ecobubble since beginning of October 2019 and, so far, have had the engineer out at least 4 times. With Covid 19 not being able to wash my work clothes or especially the towels it is very worrying. It would seem that it is a common fault and I am surprised there has not been a recall on the product. It seems to be a case of profit over funcionality/customer satisfaction.