EA4500 guest network re-authentication doesn't work

I have successfully set up a guest network on my EA4500. Guest laptop associates with guest SSID just fine. Then via IE, it gets prompted for the guest password, which is entered and accepted just fine. At this point guest laptop is on the network. Hooray!
BUT... at some point the guest laptop will need to reauthenticate (I don't know what the timeout is, but maybe one or two days?). Anyway, it's at this point that IE presents the guest network login page. But now after typing in the password, "enter" or clicking on the button does nothing. It looks like the guest web page doesn't get loaded properly or completely, so the reauthentication can't complete, therefore can't get to the internet. So, while in this state, I've also tried Firefox and Chrome, and same thing, no action when trying to submit the guest password. Tried rebooting guest laptop, and still same problem. Only thing I've found so far that works is to reboot the router. So I'm guessing there's a problem with the guest/web server on the router?? It's a real pain to have to reboot the router every day or two, when I've had other Linksys routers run for months without having to touch them.
I was running CCC 2.1.38 when I first noticed the problem. Since then I've downgraded to Classic 2.0.37, but it seems I still have the same problem. Again, I can connect & authenticate just fine initially, but when reprompted after some period of time, it doesn't work.
I've tried contacting Cisco support, but it looks like I'm at 91 days since purchase and thus outside of my 90-day complimentary support, so they happily provided me with the premium support options just to have the honor of talking with them. Guess I shouldn't have spent so much time trying to figure this out myself.
I've searched the forums here,but so far haven't found any answers (I do see posts where the guest web page isn't presented at all, but in my case the page is presented, just can't do anything). Anyone seen this or have any ideas?

jaymay -- I agree there's no harm in a reset; just the time to reconfigure, reenter DHCP reservations, etc. I'll keep this as an option as I troubleshoot, but see next...
TEXXSHARKK -- good news/bad news ... I ended up not yet resetting. Instead, since I had this problem first with CCC firmware 2.1.38 (Build 138828 - the automatically pushed update), I reverted back to Classic 2.0.37. Still same problem with guest re-authentication. Only workaround was to reboot the router. That's when I first posted.
So, since I had the problem with both CCC and Classic firmware, I ended up going back to CCC. To do that, I needed to manually update, which is 2.1.38 (Build 138880 for web manual download only). SInce (re)updating the firmware, I haven't had a repeat of the original problem. It's been about a week now, and the guest laptop has gone through a number of re-authentications, all without problem. For continued troubleshooting, I've been periodically connecting my iPad, BlackBerry, etc, to the guest network, and they get through the authentication page just fine as well. So that's the good news in that the problem "seems" to have gone away.
The bad news is that it's still unexplained:
- There's what I assume is a just a minor build difference between the two CCC firmwares, so it seems unlikely that would make a difference?
- Could be just the fact of reburning the firmware corrected whatever the problem was -- a la doing a reset, even though I didn't reconfigure, just firmware (re)update
- Could be the problem is still there biding its time, waiting for me to think it's forever gone, only to pounce again
If the problem does reappear, I'll update here.

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