DHCP issue

Hello

We have a Windows server 2012 R2 domain controller that has approx 15 users and all users network icon in the system tray shows no connectivity albeit users are able to access the internet and network folders etc.

In the last few days, devices have started to drop off the network randomly and receive APIPA addresses.

DHCP role is installed on the server and dhcp is turned off on the router.

Devices had a reservation in dhcp and there is a large IP scope available

We have re-installed the dhcp role on the server but still have this issue.

Would appreciate any help with troubleshooting this.

Thanks
adding7Asked:
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Iamthecreator OMCommented:
Check the event viewer log on the DHCP server.It seems you might have issues there and the clients are not able to ping the DHCP servers at times hence drops the configuration.What clients are you using?
Win7?
Also did you authorize the DHCP server after installing the role?
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adding7Author Commented:
Thanks for the reply Rahul

All of our clients are running Win7 and the DHCP is authorised.

The only error reported is but not sure if relevant is:

The DHCP service has detected that it is running on a DC and has no credentials configured for use with Dynamic DNS registrations initiated by the DHCP service.   This is not a recommended security configuration.  Credentials for Dynamic DNS registrations may be configured using the command line "netsh dhcp server set dnscredentials" or via the DHCP Administrative tool.
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Iamthecreator OMCommented:
Check the following article.
You can test by changing the registry on one of the client to see if it makes a difference.

A computer loses its DHCP IP address if a DHCP server is not available in Windows 7 or Windows Vista
https://support.microsoft.com/en-us/kb/958336
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