Bought this machine (WW80J5555FX) used, few month ago. It run without any problems until recently.
When I try to turn it on - it rarely stays on and shuts off after 1-10 seconds. Sometimes can't turn it on at all.
I can make it work if I disconnect the power cable for at least a minute, plug it back in, and then turn it on and start the program quickly. If I am not fast enough with starting the program it will just turn itself off completly and I will need to try the unplugging and plugging the power back in method.
On top of that the machine turns itself off at some point during the cycle from time to time. Multiple times I had it run with no issues, but sometimes I go back to check on it after couple of hours, when the load is supposed to be completed, but I find the softener liquid still in the compartment (thats how I know it didn't go through the whole cycle).
Tried inspecting the board, but can't see any visible damage to the capacitors or any other burned marks. Found that using a hair dryer on the inside of the washing machine helps, but not always, so might be a placebo (found this idea on a youtube video from someone with similar issue).
It does sound as though your Washing Machine will need to be inspected by an engineer. Have a look at the following link for some useful troubleshooting steps, along with your repair options: https://www.samsung.com/uk/support/repair/