DNS records not always updating / up to date / correct

Hi
We have a local domain with a primary DC running Windows Server 2008 R2 along with DHCP and DNS (AD integrated), and a secondary backup DC running Windows Server 2008 (non-R2), however it has been off for a very long time due to malfunctioning
hardware. We also have another domain on the same LAN in a different forest altogether which has a trust set up between these two domains. This other domain has a Windows Server 2008 R2 as the primary DC and utilizes the first mentioned DC for DHCP
as well. The LAN has physical Ethernet connectivity and WiFi as there are mostly laptops as workstations. DCHP leases are set to 24 hours and DNS Aging and Savaging is configured for both domains.
I have been troubled by an issue for some time now where in some cases there is a mismatch with the IP a laptop has and what DNS has captured. I tried to reproduce the issue but I am unable to do so: I would connect a laptop via cable, then switch
to WiFi and then back again, each time DNS gets updated accordingly. I have tried the same tests with both connected simultaneously while switching between them as well.
What is curious is that I experience this intermitted issue in both DNS forward lookup zones for the respective domains. Keep in mind as I said previously that these are completely separate domains from different forests with a trust
configured between them. Other than the trust which they have in common, the DHCP is also in common which makes me suspect the issue is related to it. I have configured the IPv4 DCHP setting: "Always dynamically update DNS A and PTR records"
and ensured credentials were set which will be used to register and update records on behalf of clients.
This issue is causing problems with internet access through our hardware firewall as the sessions are dependant on the accuracy of DNS. Please, could anyone try and assist me. Thank you in advance.   

I have made an interesting discovery. At one point yesterday client was connected to both cable and wifi which means DCHP had 2 leases for each adapter respectively. Later in the day wifi was completely turned off though a physical toggle switch on the
machine and only plugged in via cable. Further in the day I had the user complain that there is no internet connectivity (remember I said our firewall is dependant on the DNS' accurancy). Upon inspection I found that DNS had the IP of the wifi adapter and
not the one from cable, yet the wifi adapter is turned off completely for a couple of hours. I ran ipconfig /registerdns which corrected the A record, however only for about an hour after which the wifi IP overwrote the record again. I ended up deleting
the wifi adapter's DHCP lease late in the afternoon after which we all left for the day not too long thereafter. In the morning I had the same complaint of no internet access to again find that the cable IP is not reflecting in DNS for the client's A record
and now found a completely new IP which it did not have before, yet according to DCHP, the MAC address matched the wifi adapter. When I checked, the wifi adapter was still completely off. Somehow someway the record keeps on being overwritten by something (suspect
DHCP), even if the other adapter is completely turned off?!

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