Odd... I was just notified this morning of Public Beta 6 of iOS 11.2...
Seems odd Apple would release the GM of 11.2, if they are still pushing out beta versions to us Beta program participants...
Apparently there are a few people who upon installing the 11.2 upgrade have a problem of multiple crashing. So mayhap what you are seeing is a public beta of 11.2.1 to try and find that bug? My installs on four devices went without a hitch.