Mine has the opposite problem - opens unexpectedly!
Sometimes I push the "close" button, get bored waiting for it to close all the way and wander off. Come back to find its open again, like a hungry hippo.
It does it if it encounters resistance. I've had to learn to not get bored and watch it all the time! On previous ones, I'd just slam it and if it met with resistance, try again but harder. If that didn't work (it usually did) then I'd have a look to see if something important was going on. By then it was probably no longer important, just expensive to replace.
Sometimes I push the "close" button, get bored waiting for it to close all the way and wander off. Come back to find its open again, like a hungry hippo.
It does it if it encounters resistance. I've had to learn to not get bored and watch it all the time! On previous ones, I'd just slam it and if it met with resistance, try again but harder. If that didn't work (it usually did) then I'd have a look to see if something important was going on. By then it was probably no longer important, just expensive to replace.