AD, DHCP server not visible on network anymore

I've got a Domain with redundant AD servers - one physical, the other virtual. The physical is 32bit version of Server 2008, the virtual is a 64 bit version of Server 2008 R2. Everything have been working fine for about two years. I recently have been having
trouble with the physical server as it also serves as our backup server and our autoloader went AWOL on us. All that is back under control but shortly into that process I began noticing that the physical server kept dropping off the network - as in other computers
can't ping it, not can it ping other domain computers. It was a bit intermittent as it did finally connect after up and running for an hour or so - but that's not guaranteed either. It can see the internet so it appears to be a domain issue as opposed to a
network hardware issue.
I've looked through the system log but don't see anything that catches my eye.
Any suggestions?

Sorry for the delayed response. I thought I would receive email notifications, but alas.
The offending server (Glaurung) has a single network adapter - no pairing issues.
Nothing can ping either AD server - probably because it's not allowed by default as Jesper indicated. What I meant to convey was I cannot connect via Windows Remote Control when Glaurung initially boots up. The first time I try to connect, it does log in
but the service gets dropped and does not function for several hours (not sure exact time span). It does eventually work - as in the next day. Once it's back it seems stable.
I have not done any restores since initially setting up the redundant ADs (2 years ago).
Below are the two IPCONFIG commands.
HOST:  Glaurung.basic.local
C:\Users\BUMonkey>ipconfig /all
Windows IP Configuration
   Host Name . . . . . . . . . . . . : Glaurung
   Primary Dns Suffix  . . . . . . . : BaSIC.local
   Node Type . . . . . . . . . . . . : Broadcast
   IP Routing Enabled. . . . . . . . : No
   WINS Proxy Enabled. . . . . . . . : No
   DNS Suffix Search List. . . . . . : BaSIC.local
Ethernet adapter NIC2:
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Intel(R) PRO/1000 XT Network Connection
   Physical Address. . . . . . . . . : 00-0B-DB-93-E5-AC
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
   IPv4 Address. . . . . . . . . . . : 192.168.1.2(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . : 192.168.1.1
   DNS Servers . . . . . . . . . . . : 192.168.1.5
                                       192.168.1.2
                                       152.1.14.14
                                       152.1.14.53
   NetBIOS over Tcpip. . . . . . . . : Enabled
Tunnel adapter Local Area Connection* 9:
   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : isatap.{E67C2420-CF45-4BEE-A801-EA8F64B9E
30A}
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
HOST: Lola-DC2.basic.local
C:\Users\BUMonkey>ipconfig /all
Windows IP Configuration
   Host Name . . . . . . . . . . . . : lola-DC2
   Primary Dns Suffix  . . . . . . . : BaSIC.local
   Node Type . . . . . . . . . . . . : Broadcast
   IP Routing Enabled. . . . . . . . : No
   WINS Proxy Enabled. . . . . . . . : No
   DNS Suffix Search List. . . . . . : BaSIC.local
Ethernet adapter vNIC:
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Microsoft Virtual Machine Bus Network Ada
pter #2
   Physical Address. . . . . . . . . : 00-21-9B-9C-DA-06
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
   IPv4 Address. . . . . . . . . . . : 192.168.1.5(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . : 192.168.1.1
   DNS Servers . . . . . . . . . . . : 192.168.1.2
                                       192.168.1.5
                                       152.1.14.14
                                       152.1.14.53
   NetBIOS over Tcpip. . . . . . . . : Enabled
Tunnel adapter isatap.{984E1962-E7D6-411D-A989-ABCCE6589BE0}:
   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Microsoft ISATAP Adapter
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
Tunnel adapter Teredo Tunneling Pseudo-Interface:
   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
Thanks!

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