Lion says "can't connect to internet" after sleep; network is fine

So our two-month-old MacBook Pro has developed an unusual tic. Now when we wake it from sleep, it is initially unable to access the internet through browsers or mail -- even though AirPort is connecting to the network and other devices on the network (iPhones and computers) can reach the internet just fine. Running Network Diagnostic says that the internet connection is fine. After several minutes, with no user input, it restores the internet connection. This machine is running OS X 10.7.2.
Here is what I found in Console when I slept the computer and woke it (note that "tardis" is our wireless network):
10/28/11 9:02:15.000 PM kernel: sleep
10/28/11 9:02:52.000 PM kernel: Wake reason: EC.LidOpen (User)
10/28/11 9:02:52.000 PM kernel: Previous Sleep Cause: 5
10/28/11 9:02:52.000 PM kernel: wlEvent: en1 en1 Link DOWN
10/28/11 9:02:52.000 PM kernel: AirPort: Link Down on en1. Reason 4 (Disassociated due to inactivity).
10/28/11 9:02:52.000 PM kernel: en1: 802.11d country code set to 'X0'.
10/28/11 9:02:52.000 PM kernel: en1: Supported channels 1 2 3 4 5 6 7 8 9 10 11 36 40 44 48 52 56 60 64 100 104 108 112 116 120 124 128 132 136 140 149 153 157 161 165
10/28/11 9:02:52.000 PM kernel: Sound assertion "0 == fAudioEngineArray" failed in AppleHDADriver at line 3047 goto Exit
10/28/11 9:02:53.000 PM kernel: en1: 802.11d country code set to 'US'.
10/28/11 9:02:53.000 PM kernel: en1: Supported channels 1 2 3 4 5 6 7 8 9 10 11 36 40 44 48 52 56 60 64 100 104 108 112 116 120 124 128 132 136 140 149 153 157 161 165
10/28/11 9:02:53.166 PM UserEventAgent: CaptiveNetworkSupport:CaptivePublishState:1211 en1 - PreProbe
10/28/11 9:02:53.173 PM configd: network configuration changed.
10/28/11 9:02:53.000 PM kernel: nstat_lookup_entry failed: 2
10/28/11 9:02:53.000 PM kernel: nstat_lookup_entry failed: 2
10/28/11 9:02:55.000 PM kernel: MacAuthEvent en1   Auth result for: 00:14:6c:94:93:72  MAC AUTH succeeded
10/28/11 9:02:55.000 PM kernel: wlEvent: en1 en1 Link UP
10/28/11 9:02:55.000 PM kernel: AirPort: Link Up on en1
10/28/11 9:02:55.000 PM kernel: en1: BSSID changed to 00:14:6c:94:93:72
10/28/11 9:02:55.000 PM kernel: AirPort: RSN handshake complete on en1
10/28/11 9:02:55.044 PM configd: network configuration changed.
10/28/11 9:02:55.070 PM UserEventAgent: CaptiveNetworkSupport:CaptivePublishState:1211 en1 - Probe
10/28/11 9:02:55.071 PM UserEventAgent: CaptiveNetworkSupport:CaptiveStartDetect:2343 Bypassing probe on tardis because it is protected and not on the exception list
10/28/11 9:02:55.071 PM UserEventAgent: CaptiveNetworkSupport:CaptivePublishState:1211 en1 - Unknown
10/28/11 9:02:55.073 PM configd: network configuration changed.
10/28/11 9:02:56.563 PM ntpd: bind(25) AF_INET6 fe80::2acf:daff:fedf:b3a6%5#123 flags 0x11 failed: Can't assign requested address
10/28/11 9:02:56.564 PM ntpd: unable to create socket on en1 (57) for fe80::2acf:daff:fedf:b3a6#123
A short time later, Safari was able to connect to the net. Console then added this:
10/28/11 9:04:32.238 PM airportd: _doAutoJoin: Already associated to “tardis”. Bailing on auto-join.
10/28/11 9:04:32.000 PM kernel: en1: BSSID changed to 00:14:6c:94:93:72
Does this mean anything to anyone? Thanks in advance for any help you can offer.

I am having the exact same problem.  It started with 10.7, was fixed with 10.7.1, then came back again with 10.7.2.

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