I'm using the latest DD-WRT buffalo firmware with this router and have no wireless problems at all. I read somewhere that issues are solved by setting a specific channel for the wireless rather than choosing auto, so I did.
If you're using the DDWRT firmware, I recommend starting syslogd under the services tab, and specifying the IP of a computer in your LAN that will receive the log messages. For viewing the messages in windows computers, I recommend installing 'kiwi free syslog server'. This will help you troubleshoot any errors from the router.