I would give their issue tracker a check. I searched “4.3.2 crash” and found several results that sound related to your issue. You can use the following link to get to the issue tracker query right away:
I would recommend running the LTS version which stands for Long Term Support unless there’s something really needed in 4.3 for a project. If that’s the case, then try an experimental release to see if your issue has been resolved. The following link will take you to the LTS releases:
There are many types of switches. The inner workings of a mechanical keyboard switch are just one example of them.
Here are some links to help understand what’s happening in a keyboard switch and the different types of switches.
Types of switches (general):
https://www.electronicshub.org/switches/
Difference in keyboard switches (with animations):
https://www.thekeyboardco.com/blog/index.php/2012/12/an-introduction-to-cherry-mx-mechanical-switches/
A (maybe) over-comprehensive guide to keyboard switches:
https://switchandclick.com/mechanical-keyboard-switch-guide/