Active Directory

Hi,

That's a fairly big topic but the main causes are network connectivity / DNS related, or in some cases, the machine password expiry (which is every 14 days by default).

You will get a very small % of devices losing connection to AD though, which would be considered "normal" behavior.

The most common issue we've seen is the Mac clock being >5 mins off from the AD server(s).
Take a look at that, and if possible, use a time server under Date & Time.

Further to @scottb if your running dual boots depending on what time format Windows is using you might need an ntp command set to run on startup on the Macs, otherwise you can find that immediately after booting back to Windows you can't log in.