Reset answers from a user after leaving page?

Yes, this would be great to have this feature in a separate module.

I have tried it and it is working for me! Great!
The only problem is, that when updating already existing closed questions (the once that I have written based on the 7x-2.3 and not on the latest dev version) I am getting a white screen after saving. But this seems to be a minor problem as I can write the questions new ...

Sorry, I was too quick.
The problem with the white screen is remaining at some - also newly created - closed questions )(e.g. multiple answer). The first time, when trying to save the node, the system is unchecking the before checked option. When trying once again, the white screen happens. I can only repair this bug by using the back browser and unchecking again ...
Another problem is, that if the option remains checked, than the showing of the hints is no more working. Instead of showing one hint after another, the first and the second hint are shown at the second try (and not only the second one) and all three hints are shown at the third time.

Yes, I did clear all caches.
I have tried it once more ad it is every time the same: As soon as I am changing anything in the question node and do not leave the given examples untouched, the problem occurs. So it is not possible at all to use the module.
When checking the option, the first time while saving the system is unchecking it by itself. When checking it once again and trying to save it, I get the white screen.