As you're on Sierra, I'd recommend submitting a bug report. These sorts of things happen with beta OSs.
You can try the usual things:
- Run volume verification in Disk Utility, check all is OK
- Reset PRAM (hey, why not)
- Hold CMD+R on startup to boot into OS X Utilities. Select 'Reinstall OS X'. This will only reinstall core OS components and won't delete any user data/applications.
I'm reverting back to El Captain. There are to many bugs on Siera. Like when I rebooted the system would lockup on entering password for hard drive. Then once it got into the is it locked up again! I did 4 hard reboots and same thing. View attachment 647738
Yeah, I avoid betas for the same reason. I much prefer stability over getting early peeks at new features. Even the most hardened beta enthusiasts wouldn't recommend using it for your a daily driver.
I think the last beta I ever downloaded & used as my daily driver was DP2 10.8 Mountain Lion and I bitterly regretted it. What a terrible experience. Never again.
mine is doing the same what can I do? I'm on the final release