Hmmm ... I'm using a DG834G and all seems fine.
Which model is yours? Mine is v2 (see the
DG834G family support page for details)
Have you tried flashing the firmware to the latest version? I flashed mine to Version 3.01.29 earlier in the year, but the highest version on the above site now seems to be back to Version 3.01.25. Googling suggests that it did not working properly with static routes?
My config consists of a custom SSID, WPA-PSK encryption and Wireless Station Access Control enabled. The one thing that I've not been able to do is hide the SSID, as many laptops (including our work Dells, it turns out) get upset when SSID is hidden.
Again, a quick Google suggests that a hidden SSID is a minor inconvenience but no barrier whatsoever to a hacker that wants to get into your network.
RC