Systems becoming "unauthenticated" randomly in network

Several of our systems will randomly have the network connection become "unauthenticated" and will loose connectivity to web pages and Office 365 through Outlook.  Ping will still work and Lync remains connected for a while.  The only
way to remedy is with a reboot but that is not permanent as the issue will return some time later.  We have tried re-joining the domain, cycling ipconfig, flushing dns, and even changing hardware.  I'm not sure what to do at this point.  Any
insight would be great.

Hi Joshua,
Thanks for your reply.
we appreciate it if you could keep updating this issue.
It is possible that other software causes this kind issue.
Also try ping your Domain controller by using FQDN when this issue occurs.
Thanks
D. Wu
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    I have the same problem of randomly losing network connection over wireless, though mine is hardly related to surfing.
    I have an external storage drive in which I use for backup of my stuff, and I access the drive via my modem, using the airport. Of late, I noticed that when copying files from my iBook to the external drive, the connection would suddenly drop before the transfer is completed. This began to occur with increasing frequency, particularly when transferring large files.
    I have since abandoned wireless connection, and reverted to my trusty cable. Still, I admit that I'm really curious about the cause of the apparent lack of reliability with my wireless connection. Has it something to do with the airport?
    1.33 GHz iBook G4   Mac OS X (10.4.5)   New to Mac, just switched from Windows 4 months ago.

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