Problems with AirPort - WRT54GL (for a short time)

Hi!
If have an old MacBook with Core Duo (OS X 10.4.10, all updates installed). The last days I have more and more problems with my WLAN. I use a WLAN DSL-Router (Linksys WRT54GL with original firmware v4.30.7). The problem is, that after some time while everything works perfectly, AirPort is still connected to the WRT54GL, but I cannot reach the Router anymore (no ping, no tcp connection to the router or to any computer in my network or the internet). At the same time router works fine for other computers. When I disable AirPort and enable it again, it connects again and everything works fine again. Any idea what the problem could be? Before the problem occured for the first time some weeks ago, it worked perfectly for more than one year with the router (no firmware update). The WLAN signal strengh is between medium and strong.
The only problem I had with the router was, that I had to use WPA2, because WPA did not work for my MacBook. And it's not very fast, but that's not so important. The latest problems are really annoying, e.g. when I wrote a long email using webmail, the connection was lost and after I reenabled AirPort, the text was gone.
Does anybody know how I could find and solve the problem?
best regards
Andreas

You can't power it down from the AirPort Utility, but you could use the Timed Access feature to control when certain network devices can access the base station itself. Timed Access relies on the device's MAC hardware address and will control access to the router on a time basis.
You would find this feature on the AirPort > Access Control tab within the AirPort Utility.

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