Weird problem--lost network connectivity wifi and ethernet. Intermittent

I'm posting to this board because my Time Capsule is my router and I suspect this is a router table issue since it affects both wifi and ethernet computers in my household.  It only affects the two computers on 10.8.3 at the moment. 
Either just after waking from sleep or after working for quite some time on either of these computers, web sites will stop loading.  It gives an SSL error but they are not secure sites.  Mail stops coming in as well.  This is true for any browser.  The network connections test as "green" with the built-in diagnostics tools.  The only fix I have found is to either restart the machine or simply log out and log back in from the user account.  It is very frustrating because we are often working in real-time online.  Standard things we use that are affected are Google Docs for schoolwork etc. and my son's Minecraft playing.  It is especially frustrating for him because he could be in the middle of a "project" with some of his friends online and this essentially crashes what they were doing.
I have called Apple but it is very hard to explain the issue in an effective manner.
Both machines are logged in as managed accounts but unrestricted access.  I just don't like my primary account to be an admin account.  I don't want my kids to install stuff without my permission and the managed user allows me to inspect the logs of sites they have visited at the system level, even if they turn on private browsing in Safari or incognito in Chrome.
Does anyone here have any ideas?

It is possible that I upgraded the firmware on the router right when I upgraded the machine to Mountain Lion but I really don't think I did that. I also have a version of the OLD airport utility so I can see the Time Capsule in much more detail.
Linda
If it hasn't reminded you to upgrade the firmware in the last day or so it is already on 7.6.3.. Apple stuff is very insistent on upgrades..
In the old utility (excellent) take it back to 7.6.1. And turn off weekly upgrade reminders.. this will reduce the instances of upgrade reminders to weekly instead of daily.

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