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Same thing on mine Early 2015 MacBook Air. Both on beta 4 and 5.But today I managed to discover the issue which crashes my Mac, I think it's something about Photos app. I'm using iCloud Photo Library, I have pretty massive library (about 63K photos) and "Optimize disk space" option enabled.Anyway, I launched a MacBook, opened Activity Monitor app, set on CPU tab and processes sorted by the % of CPU usage, and CleanMyMac widget to have the info about CPU usage and temperature, and I left the MacBook alone to reproduce the thing that I'm not using it. Suddenly the process called "photolibraryd" appeared first on the list, taking 142% of CPU (idk how's that even possible). I remember that lastly when I got to the photos app it was saying on the bottom of photos view that it's "sorting my photos".And I think it does make some sence actually, some of you were talking that this bug doesn't occur when the Mac is disconected from the power supply, and Photos app wasn't taking any of backgroud actions when the Mac is on battery, so I think this operation is not being taken as well.I encourage you to test it out on your Macs as well, maybe it's a major problem, or maybe it's just mine and yours are being triggered by something else.

Same here with my MacBook Air.But this bug keeps appearing since beta 4.Anyway I also made some kind of experiment. I launched a Mac, opened a system activity app and CleanMyMac widget to have the info about CPU usage and its temperature, and processes which it takes up.I left my Mac alone, then CPU suddenly started to have usage about 85-100% and it started to raise its temperature. It had 45°C on start. Fans weren’t working.Some minutes later Mac stopped working, the screen froze over and now the fans started to run. CPU’s temperature was 68°C. And the first process in system activity, sorted by the most CPU usage was “photolibraryd”, so I think there’s something wrong inside photos app.I’m using iCloud Photos, the option “optimize disk space” on this Mac is on, and the library itself is big (about 63K photos), and it takes about 200GB on iCloud. Photos app was saying that it is sorting my photos, maybe that’s what it makes my Mac hot-froze over?Moreover, after reset I launched the system activity app and I was constantly killing the photolibraryd process, but it kept "healing" and turning back to the procesess list. So I was killing it as this process wasn't appearing on the list. And now everything is normal.I encourage you to do the same experiment on your Macs.Sorry for my mistakes in English if they appearaed. Polish guy here.