You shouldn't be having any random disconnects on v1.22NA. I have been running since it's release and haven't seen any issues on wired or wireless. And I game a lot. Can you detail on what your seeing and how your setup is configured? Wired or wireless? DSL or Cable? Please review the ATT DSL post about DSL issues seen if you have DSL.
As for 5Ghz, I would ensure that ur ASUS device is supportive of 5Ghz and the latest drivers are installed. One thing to mention about 5Ghz, it seems to work well if used as a Line of Sight kind of connection. The higher the frequency, the more susceptible that interference from walls, doors and floors can have an impact while using this freq. Again let us know what your looking to do for wireless. You can review my Gaming and Gamefuel for some additional 2.4Ghz settings that seem to work well for general used or gaming.
Let us know.