Why does my Airport network suddenly not allow my iPhone to join?

Hello all. Earlier this year I replaced our home network, which was two older Airport Expresses in a WDS with a new Airport Extreme plus an Airport Express to extend the network. Everything throughout the house worked great. Then a couple of weeks ago things got a bit screwy. I won't bore you with all the details, and can't remember them anyway, but the short version is:
-computers upstairs connect unreliably. Both airports are downstairs. Upstairs computers have been fine in the past though.
-my iphone can't connect via wifi at all anymore. Either the password is not accepted or I get a 'unable to connect to the network' message. This with the phone in the same room as the Extreme base station.
-as far as I can tell, nothing in the house or our equipment had changed when the trouble started. We did add two new-ish iMacs to the home network, both took over the roles, accounts, etc of other machines via Migration Asst, after the problem surfaced. The machine downstairs is fine, the one upstairs connects to the network intermittently. The problem upstairs is odd, the signal appears to be very strong, but password is rejected sometimes.
-the computers downstairs close to the Express were affected at first, but restarting the Express fixed that part of the problem. I have also restarted the Extreme, which seems to have made no difference.
I'll be grateful for any suggestions. Thanks!

You might want to delete the current wireless connection on the iPhone and then set it up again.
On the iPhone.....
Settings > WiFi
Click the small arrow at the right of your wireless network name to display more info
Click "Forget this Network"
Power off the iPhone, then restart it
Setup the connection again to see if that helps

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Panics Since Last Report:          1
Anonymous UUID:                    17D8F909-09A9-4BC6-A153-A12F75529506
Sun Jan 27 09:32:57 2013
panic(cpu 0 caller 0xffffff80002c4794): Kernel trap at 0xffffff80002b4b31, type 14=page fault, registers:
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RAX: 0xffffff80008c2028, RBX: 0x00000000800a9100, RCX: 0xffffff800ae5bf00, RDX: 0x0000000000000080
RSP: 0xffffff8078713e68, RBP: 0xffffff8078713eb0, RSI: 0x000000005aefd876, RDI: 0x00000000800a9118
R8: 0x0000000000000010, R9: 0x0000000000000000, R10: 0xfffffe802662d000, R11: 0x00080000000263f3
R12: 0xffffff8078713f60, R13: 0xffffff8078713f78, R14: 0x0000000000000000, R15: 0x00000000800a9118
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0xffffff8078713b90 : 0xffffff80002c4794
0xffffff8078713d40 : 0xffffff80002da55d
0xffffff8078713d60 : 0xffffff80002b4b31
0xffffff8078713eb0 : 0xffffff80002352a5
0xffffff8078713ec0 : 0xffffff800036489d
0xffffff8078713ee0 : 0xffffff8000345031
0xffffff8078713fb0 : 0xffffff8000820057
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Mac OS version:
11G63
Kernel version:
Darwin Kernel Version 11.4.2: Thu Aug 23 16:25:48 PDT 2012; root:xnu-1699.32.7~1/RELEASE_X86_64
Kernel UUID: FF3BB088-60A4-349C-92EA-CA649C698CE5
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System uptime in nanoseconds: 1750251829240
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Model: iMac10,1, BootROM IM101.00CC.B00, 2 processors, Intel Core 2 Duo, 3.06 GHz, 4 GB, SMC 1.52f9
Graphics: NVIDIA GeForce 9400, NVIDIA GeForce 9400, PCI, 256 MB
Memory Module: BANK 0/DIMM1, 2 GB, DDR3, 1067 MHz, 0x80AD, 0x484D54313235533642465238432D47372020
Memory Module: BANK 1/DIMM1, 2 GB, DDR3, 1067 MHz, 0x80AD, 0x484D54313235533642465238432D47372020
AirPort: spairport_wireless_card_type_airport_extreme (0x168C, 0x8F), Atheros 9280: 4.0.67.5-P2P
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Network Service: AirPort, AirPort, en1
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