N900 802.11 connectivity issues

I've had my N900 for just over a week now and have had no issues with it until yesterday.  Since I'm an AT&T user in the US, I don't have 3G support, so when I'm at home I have it autoconnect to wifi and use that around here.  Yesterday it started where I would just randomly lose connectivity over wi-fi.  The phone would still say I'm connected, I would still have an IP, and my router will still show the connection as active, but my phone wouldn't be able to browse anywhere, and trying to get to my router would give me a "connection refused" instead of a not-found error in the browser.
Sometimes I can just disconnect the network, wait for a minute and reconnect, and it'll work again, but usually only for a few minutes.  I've tried reboots as well, to no avail.
Anybody have any ideas or suggestions?
Thanks!

Yeah, it makes sense.  But rootsh helped me do what I need to.  Here's the info from dmesg.  I just connected to carrier cell data and then made sure it worked, connected back to my wifi, made sure it worked, then it dropped.
Remember - all this time I could see the device connected in my router, and my laptop was on right next to it working.
[53961.265045] slide (GPIO 71) is now open
[54128.394134] gprs0: attached
[54133.888641] wlan0: deauthenticating by local choice (reason=3)
[54134.210632] wl1251: down
[54272.390167] wl1251: 154 tx blocks at 0x3b788, 35 rx blocks at 0x3a780
[54272.405761] wl1251: firmware booted (Rev 6.0.4.156)
[54273.343414] wl1251: down
[54275.601013] wl1251: 154 tx blocks at 0x3b788, 35 rx blocks at 0x3a780
[54275.616790] wl1251: firmware booted (Rev 6.0.4.156)
[54276.533355] wlan0: authenticate with AP 00:1d:7e:3d:90:a7
[54276.536529] wlan0: authenticated
[54276.536590] wlan0: associate with AP 00:1d:7e:3d:90:a7
[54276.540710] wlan0: RX AssocResp from 00:1d:7e:3d:90:a7 (capab=0x411 status=0 aid=1)
[54276.540740] wlan0: associated
[54279.775451] wlan0: roaming signal from driver, sending LOWSIGNAL
[54286.151123] gprs0: detached
[54294.828948] wlan0: roaming signal from driver, sending HIGHSIGNAL
[54296.057617] wlan0: roaming signal from driver, sending LOWSIGNAL
[54306.195739] wlan0: roaming signal from driver, sending HIGHSIGNAL
[54307.219848] wlan0: roaming signal from driver, sending LOWSIGNAL
[54308.243682] wlan0: roaming signal from driver, sending HIGHSIGNAL
[54310.496795] wlan0: roaming signal from driver, sending LOWSIGNAL
[54318.996795] wlan0: roaming signal from driver, sending HIGHSIGNAL
[54320.225433] wlan0: roaming signal from driver, sending LOWSIGNAL
[54336.098358] wlan0: roaming signal from driver, sending HIGHSIGNAL
[54337.633911] wlan0: roaming signal from driver, sending LOWSIGNAL
[54369.484436] wlan0: roaming signal from driver, sending HIGHSIGNAL
[54439.937744] wlan0: roaming signal from driver, sending LOWSIGNAL
[54482.297515] wlan0: beacon loss from AP cf1bb52c - sending probe request
[54488.176361] wlan0: driver reports beacon loss from AP cf1bb52c - sending probe request
[54573.265319] wlan0: roaming signal from driver, sending HIGHSIGNAL
[54576.132568] wlan0: roaming signal from driver, sending LOWSIGNAL
[54579.818908] wlan0: roaming signal from driver, sending HIGHSIGNAL
[54592.926910] wlan0: roaming signal from driver, sending LOWSIGNAL
[54593.950958] wlan0: roaming signal from driver, sending HIGHSIGNAL
[54627.232177] wlan0: roaming signal from driver, sending LOWSIGNAL
[54628.358581] wlan0: roaming signal from driver, sending HIGHSIGNAL
Now that I'm at the PC with it plugged in in Mass storage mode to pull dmesg log from my phone it seems to have picked up the wifi and is blazing along...
I just don't understand.

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