Network Devices not able to connect to the Internet, but local network has no issues.

Hello All,
I have been having this problem for the past 4 months or so(ever since I got the server).  I have a Windows Server 2012 R2 machine running a DHCP server.  I have 2 network devices installed on it.  One hardwired to the motherboard and one
connected by a PCI-E slot.  I got a second card because I thought something was going on with the primary NIC.  However I have the same issue with the 2nd NIC.  I have remedied the issue by setting the server to restart every 2 days, very inconvenient. 
After restart, everything is fine for 2 days.  All drivers are fully up-to-date and Windows is up-to-date as of last months' updates.  I also updated BIOS to the latest version.  Any help will be much appreciated.
I have ruled out hardware issues, and here are my specs:
Intel Core i7 3rd Gen @3.4GHz
8GB DDR3 RAM
Server 2012 R2 Standard 64-Bit
Intel On-board Gigabit Ethernet
TrendNet Gigabit PCI-E (Realtek Chip embedded, uses Realtek drivers)
Thanks

Hi,
Is DHCP the only service that the server is used for?
What are you using for DNS?
When internet connectivity is lost on a client device, what does IPConfig show (a correctly assigned DHCP address or an APIPA address)?
Is DHCP AD Integrated?
How long is the DHCP lease?
Steven Hodson | http://www.stevenhodson.com | @_hodders
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