Regarding your second question - unless you were kicked for being afk, which I assume wasn't the case, then it was a server crash. You didn't get booted out after solving a puzzle - the whole server actually crashed several minutes ago and your game finally gave up on re-establishing the connection. Everybody was booted out. This happens from time to time and we can only hope they improve things in the upcoming patch in a couple days.

As for the first question - not much clue. I'd try backuping and deleting the config file and see if it keeps happening anyway. Please look up the config file location, I'm on my phone atm, it's a standard UE4 path however.