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Demotion of Windows 2008 GC causing Exchange issues

We demoted a GC from Windows 2008 to a DC and since then we are facing issues with loads of error events in the Application logs and users are intermittently getting disconnected from Exchange server

Exchange 2007 SP3 all roles
3 Windows 2008 DC (2 currently still as GC)
SOLUTION
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Manpreet SIngh Khatra
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Yes already restarted the DC

Description:
Process MSEXCHANGEADTOPOLOGYSERVICE.EXE (PID=2017). Exchange Active Directory Provider has discovered the following servers with the following characteristics:
 (Server name | Roles | Enabled | Reachability | Synchronized | GC capable | PDC | SACL right | Critical Data | Netlogon | OS Version)
In-site:
DC1.Mydomain.com      CD   1 7 7 0 0 1 1 7 1
DC2.Mydomain.com      CDG 1 7 7 1 0 1 1 0 1
DC3.Mydomain.com      CDG 1 7 7 1 0 0 1 7 1
By default if you removed a DC/GC the topology service will not use the demoted one. so it is all automatic, just make sure that DNS in Exchange is pointing to the new DC. It can take upto 2 hours however
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lazarus98, What do you mean by to ensure DNS is pointing to new servers ?
Rancy, What could have caused the issue as such any way to find out ? I have corrected the Netlogon and waiting for my AD colleague to check and correct the issue with DC3
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No worries about DNS was just trying to ensure i wasnt missing out something and yes we dont have pointing to specific DC as thats not a good practise :)