DNS and three domains: what causes instability?

Question

Domain Name System

Hello!
I inherited two domains that live "in parallel" from each other. The first ("old") runs on ws2003 and serves the ads.it-corp domain (network 192.168.1.0/24), the second is up on ws2012 r2 and contains two domains: copr.it-corp.ru and it-corp. ru. (The main PC records are recorded in corp.it-corp.ru) - they are spinning in the network 10.11.0.0/22.
In principle, both domains live together, but a problem constantly arises - access from the "old" domain to resources in the new one falls off.
The other day I decided to re-raise the CD in the new network - but everything only got worse. Now access to resources is lost in the network itself, i.e. hosts do not resolve, users treat this trouble with the ipconfig / renew command, but I often noticed that it is enough to wait a couple of moments and everything starts to resolve. Where to dig and how to diagnose until I figure it out. If you explicitly write nslookup and DNS IP - everything will resolve...

Answer 1

I solved the problem as follows:
1. There was an extra entry in the DNS of the domain controllers - 8.8.8.8 (Google DNS). Kept her out of harm's way.
2. Raised the router on the Ubuntu server and configured DNSmask for their domains, specifying the corresponding CDs for their ip zones. Started up clients through this DNS - normal flight. Those. it turned out three DNS on clients: 10.11.1.1, 10.11.1.2, 10.11.1.10. Instead of 10.11.1.10 was 8.8.8.8