Windows 7 64-bit loses Internet connection over night...

I am having a strange intermittent issue with Windows 7 Ultimate.  Generally 3-4 days a week i come in and the connection to the Internet will be unresponsive.  Many times i can still connect to chat (gmail, xmpp, etc) as well as our in house mail server (even though this does cross the gateway to an external IP address).  I can even ping common websites.  But when I try to use any browser it is unresponsive.  A reboot makes everything happy again.  When i try the Microsoft troubleshooter it doesn't think anything is wrong.  Here is the list of things i've tried thus far.
1.  I have tried an additional NIC.  This has happened on both an internal and external NIC.  
2.  I have tried deleting and reinstalling NIC and their drivers.
3.  Windows Firewall is not on.
4.  This happens with all browsers.
5.  I run an "always on" profile because of different services running on the machine.  So the PC going to sleep is not an issue.
6.  I am behind a Watchguard x55e pro gateway.  But mine is the only pc experiencing this.

Thanks for your help.  
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If you ping a website can you access that same website in your browser?

Can you access Gmail in your browser?

Can you elaborate on how the browser is unresponsive?
JohnBusiness Consultant (Owner)Commented:
I would check the following:
(a) Power management services - there are settings that allow the NIC's to be turned off after periods of inactivity. Uncheck these (device manager, Windows 7 Power manager, 3rd Party Power manager). I have a Windows 7 Pro 64-bit machine that runs 7x24 and never loses the internet connection.
(b) Go to Control Panel -> Internet Options -> Advanced and consider resetting IE. Then make sure in Connection that Automatic Connection is unchecked. Make sure you are using straight DHCP.
(c) Consider resetting your Watchguard and checking the settings.
(d) As always, thoroughly check for malware.

... Thinkpads_User

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is your network interface receiving an ip address?
can you try to ping your default gateway?
can you try to ping
try to ping

Let us know the results.
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mcbathostAuthor Commented:
Thanks for your quick thoughts.

I will take a closer look to detail exactly what i can ping and can access next time it happens.  As far as the browser being unresponsive it just will not resolve web pages like the NIC is disconnected.  Although the NIC does not show any problems as far as Windows is concerned.  

I did look further into the advanced power settings.  The only thing i could find that was enabled was something called "Hybrid Sleep".  I went ahead and set that to Off.  

In our network we use mostly static IP addresses.  I use static IP and DNS addresses for this machine.  And the DNS entries are those provided by our ISP, not the gateway for redirection.  All of our statically addressed machines use these specific primary and secondary addresses.  

I will reset IE9 just in case.  I don't use it much, only when a admin portal requires it.  

A Watchguard reset and reconfiguration might be in the near future.  But i do not see this problem any other place in our network.  

Lastly i have performed Malwarebytes and Trend Micro deep scans and found nothing.  ANd i have found no evidence of proxy or host file redirection.  

Thanks again,
mcbathostAuthor Commented:
Hhmmm...I haven't lost connection since making the changes listed above.  The most concrete change was possibly the "Hybrid Sleep" setting.  Maybe that was the culprit.  We'll call this good for now.  Thank you for your help and input.
JohnBusiness Consultant (Owner)Commented:
Thank you for the update, and I was pleased to assist you. ... Thinkpads_User
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Windows 7

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