Hi,
I had a wrt54g, it suddenly fell out with the VM DNS servers after a while doing an intermittent fault.
I replaced it with an SMC item eventually (14-N2, do NOT buy one, they seem to have problems with VM too).
However, I did find stability restored with the 54G when i rolled back the firmware to the 2005 version? It's the only firmware verison available from Linksys site (
http://www-uk.linksys.com/servlet/Sa...ypage=download ) check your router version number.
Good luck!