Router looses internet connectivity randomly

I am working on an office network with 2 wireless access points and 4 desktop pcs.  The building is completely metal so we decided to put an wap on each end of the building to ensure good wireless connectivity.  The 2 waps are connected through a switch that is connected to the router.  The 4 office pcs are also connected directly to the switch.  The setup has been setup for a little over 2 years with no problems.  About a month ago it started loosing internet connectivity alot.  So we purchased a new Cisco 851 router to handle the increasing data transfer as we thought that was the problem.  The Cisco router is in place and we are still loosing internet connectivity.  

The router is setup for dhcp and the isp is Time Warner.  I really don't know where to start looking for the problem at this point and thought i would ask here first.  Anyone got any ideas what would cause it to loose internet connectivity randomly?
matte4Asked:
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MiniDevoCommented:
What type of service do you have from Time Warner? Is it a residential cable contract or small business? One of the things that would be happening is that you're exceeding your data limits through Time Warner. This is a common problem when using a residential service contract for small business. I would start with Time Warner and see if that's the cause, or if it's a technical issue on their end.
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matte4Author Commented:
okay.

I will call time warner and see if there are any issue with our account.  We are using Business class.

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MiniDevoCommented:
That will definitely be your best bet, especially if you're a business class account as you have a higher tier of tech support. They can even monitor the service and see if it's getting dropped form your end or theirs.
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naughtonCommented:
short of that there are a number of debugs on the cisco router that can assist - depending on the connection type you have.
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matte4Author Commented:
I talked to Time Warner and there seems to be no problems with the account.  However, it seems the internet connection has stabilized, giving that for the last 3 days it hasn't dropped connection.  I changed the DHCP setting to renew every 7 days instead of the 2 hours it was set to and it seems to have fixed the problem.  
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naughtonCommented:
cool,.
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