I can open the door manually, the same as when you stop the cycle to add/adjust load - I just hold down the door open (key symbol) for 3 seconds, and it opens. I tried another rinse cycle yesterday, and a separate spin cycle, and it still did not open automatically at the end of either cycle. I'm on (very soft water) rainwater tanks, so I'm not going to try it out on all lengthy cycles if I don't have to.
I'm sorry there's not much more detail to give. The mashine is washing normally and spinning normally. The only trouble I have is if I put a little too much detergent in and the load gets too soapy - eg: towels. Towels for some reason need only half the usual dose. I found that out very early. I understand how this affects the spinning, but don't believe it should affect the latch.
I will try to open the little hatch down the bottom (for blackouts) and see if that resets something.