My external drives are all ejecting, I think after sleep on High Sierra beta 10.13.1 (17B25c) any fix for this? I have just reset the SMC, just in caase.
External HDs eject on their own, using High Sierra
I don't see anything about this in the 10.13.1 beta release notes - you may want to (a) file a bug and (b) move this to themacOS 10.13 beta forum, thanks and good luck.