Sounds like dnsmasq is getting overloaded, but I am no expert and just guessing. I read here that some other people are having problems with dnsmasq and it seems the solution for them was running a snapshot build of OpenWRT. You could also try restarting the dnsmasq service to see if that fixes the issue temporarily. You could use the firmware builder page and add in luci to the package list to get an easy to use snapshot that you could try out. The snapshots I have been using are very stable on my less established hardware (Netgear Wax206) so I think they should work fine for you.
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