Question : Users Cannot Connect To Internet Without Repairing Network Connection Constantly

I am having a problem with our network that is escalating.  Our (one) internet cable comes in off the street and into a cable splitter.  From the splitter it connects to two cable modems (both modems have static IPs).  All of this was installed by the local ISP.  I asked if this was going to be a problem and they assured it me it would not.  One modem runs to a wireless router which then plugs into a patch panel.  The other modem plugs into a 5 port router that goes to two data servers and the patch panel.  The patch panel runs to other wireless routers in the building, routers, switches, and hubs which in turn connect to the user computers (around 86 computers).  

When the first person comes into work there normally is not a problem accessing the internet.  About thirty minutes later my phone will not stop ringing with people informing me that the internet is down.  When it first started happening it would only happen to certain people.  Now it is completely random and happens to just about every computer (wired or wireless internet connection).  Originally I tried fixing the problem by repairing the network connection.  This did not work, so I had the user restart the computer.  It would fix the problem, but the internet would not work throughout the day and user would constantly be restarting the computer and was unacceptable.  After some research I found that manually repairing the network connection fixed the problem without restarting.  I would have the user click start à run, type cmd à ipconfig /release à ipconfig /renew à arp d à ipconfig /flushdns.  This works but again the user has to constantly type this in throughout the day.  One day when the internet was not working on my computer I decided to document my IP settings.  They are as follows:

        Description . . . . . . . . . . . : Atheros AR5008 Wireless Network Adapter
        Physical Address. . . . . . . . . : 00-19-E3-D9-B9-3B
        Dhcp Enabled. . . . . . . . . . . : Yes
        Autoconfiguration Enabled . . . . : Yes
        IP Address. . . . . . . . . . . . : 192.168.1.15
        Subnet Mask . . . . . . . . . . . : 255.255.255.0
        Default Gateway . . . . . . . . . : 192.168.1.254
        DHCP Server . . . . . . . . . . . : 192.168.1.254
        DNS Servers . . . . . . . . . . . : 192.168.1.1
                               192.168.1.1

After running my manually repair in command prompt, I documented the change.
        Description . . . . . . . . . . . : Atheros AR5008 Wireless Network Adapter
        Physical Address. . . . . . . . . : 00-19-E3-D9-B9-3B
        Dhcp Enabled. . . . . . . . . . . : Yes
        Autoconfiguration Enabled . . . . : Yes
        IP Address. . . . . . . . . . . . : 192.168.1.15
        Subnet Mask . . . . . . . . . . . : 255.255.255.0
        Default Gateway . . . . . . . . . : 192.168.1.254
        DHCP Server . . . . . . . . . . . : 192.168.1.254
        DNS Servers . . . . . . . . . . . : 69.1.30.3
                                                        69.1.30.2

The only difference between the two is the DNS servers.  It is like the computers cannot maintain DNS server settings.  I have thought about making the DNS servers static but this is not an option since there are a large number of laptops that are used here during the day and then people take them home in the evening to work.  If the DNS servers were static they would be unable to access their internet at home.  I have tried finding similar problems, and have run across two.  The first stated that it was fixed by changing the autodisconnect setting in the registry.  I have tested this on my laptop and did not work.  The second stated that the problem comes from multiple wireless routers/access points running the same channel.  I tried changing one of the wireless access points to broadcast at a different channel.  This appeared to help for the day, but by the next day it was still dropping the DNS.  Any insight on what could be causing this would be extremely helpful.

Answer : Users Cannot Connect To Internet Without Repairing Network Connection Constantly

Upgrade the firmware settings and check to make sure it is passing the appropriate DNS. Check the other wireless routers and make sure they have DHCP turned off. By default most of these workgroup wireless routers have DHCP turned on.