Interesting. If you haven't tried it already, I wonder if trying the last release version would be better. Cuz I remember when it first came out the release version was really buggy. It took a good few months for everything to stabilize.Mid-2011 13" MBA. High Sierra was never stable for me. Locked up spontaneously without any way to recover. That was from both an in-place upgrade and a barebones vanilla install. It wouldn't even stay stable enough for me to do a TM restore, so I'm stuck on Sierra.
BL.