Windows Server 2012 R2 Active Directory and DNS issues

Ive been having some weird issues with 2 domain controllers syncing and at times the network goes down. Im presuming from the errors something is up with main AD causing DNS issues which breaks everything else. I need someone to take a look and help resolve. I need to try and get resolved tonight so if your able to start work soon thats a plus. I realize this may go beyond the cost of this project but we can determine that after initial work starts... Thanks much