When I get my (replacement) 4500, I'll try a few more things (if the wireless restarts keep happening).
To date, I have tested removal of ipv6 from any/all adapters (no change), removal of iphone4 entirely (no change), adjusted (almost) every setting in the router (no change). Using 802.11a only (as a test) made the restarts go away - but that is not practical, since all of my devices are 802.11g.
Quite frankly, the only two things I have not done are:
- Changing security from Auto WPA/WPA2 to either only WPA or only WPA2
- Leaving the firmware alone (1.21na) and testing to see if it flakes-out on that before upgrading the firmware
It is going to probably be at least 20 days before I get a replacement 4500, however - since I have to ship it back to the company, they need to "test" it to verify it is flaky, then they have to ship me another one.