AirPort has to be restarted daily

my airport extreme base station is about a year and a half old, and we just moved into a new place but have the same comcast service as we did in the old place (cable internet and digital phone run through one modem). every morning now, the computers (powerbook G4 and imac G5) recognize the network, but can't join it (we get the "error joining [our network]" message). this never happened before. we've been restarting (powering off and on) the base station every day, but does anyone have a better solution?

There is an open defect against the SRP platform (defect id CSCti60430) that results in a memory leak when we receive SIP packets from unknown devices.  Unfortunately, with all the SIP probing that goes on at present, this problem is very easy to hit, and produces symptoms like you have described.  The fix will be made available in the next maintenance release for the platform, but in the interim, there is a configuration workaround available.
If you are using the phone ports on the router, then navigate to Voice > Line x in the admin gui, and set 'Restrict Source IP' to yes (found under the SIP Settings heading).  The makes the router drop any SIP packets received that do not come from the configured proxy, and so gets around this problem.  Make sure you do this for both lines on the router.
Alternatively, if you are not using the phone ports, you can just disable them entirely.
Cheers,
Dave.

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