Possible NetworkManager problem, but where to look?

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My wife's laptop has started having interesting networking issues.
She's connecting to a WPA2 secured wireless AP.

All networking communications work fine right after boot, but at some
point all connection attempts TO her computer fail, while all
networking communications coming FROM her laptop continue to work
fine. I have tried disabling the firewall but it has no affect.

Failure Observations:
- Auto-discovered printer queues drop off
- Can no longer ssh to her machine
- nmap -sS hostname can't find that she even exists. This would be
GREAT if I wanted to be stealth on a network.

Currently the workaround is to restart NetworkManager which
temporarily fixes the problem. I'm not ready to say that NM IS the
problem as it could be something else, such as a buggy driver, that's
the root cause.

So where do I start? OS is Fedora 13 x86_64 fully updated. (lspci
posted to bottom of message)

Thanks,
Richard

---

00:00.0 Host bridge: Advanced Micro Devices [AMD] RS780 Host Bridge
00:01.0 PCI bridge: Acer Incorporated [ALI] Device 9602
00:05.0 PCI bridge: Advanced Micro Devices [AMD] RS780 PCI to PCI
bridge (PCIE port 1)
00:06.0 PCI bridge: Advanced Micro Devices [AMD] RS780 PCI to PCI
bridge (PCIE port 2)
00:07.0 PCI bridge: Advanced Micro Devices [AMD] RS780 PCI to PCI
bridge (PCIE port 3)
00:11.0 SATA controller: ATI Technologies Inc SB700/SB800 SATA
Controller [AHCI mode]
00:12.0 USB Controller: ATI Technologies Inc SB700/SB800 USB OHCI0 Controller
00:12.1 USB Controller: ATI Technologies Inc SB700 USB OHCI1 Controller
00:12.2 USB Controller: ATI Technologies Inc SB700/SB800 USB EHCI Controller
00:13.0 USB Controller: ATI Technologies Inc SB700/SB800 USB OHCI0 Controller
00:13.2 USB Controller: ATI Technologies Inc SB700/SB800 USB EHCI Controller
00:14.0 SMBus: ATI Technologies Inc SBx00 SMBus Controller (rev 3a)
00:14.2 Audio device: ATI Technologies Inc SBx00 Azalia (Intel HDA)
00:14.3 ISA bridge: ATI Technologies Inc SB700/SB800 LPC host controller
00:14.4 PCI bridge: ATI Technologies Inc SBx00 PCI to PCI Bridge
00:18.0 Host bridge: Advanced Micro Devices [AMD] Mobile K10 [Turion
X2, Athlon X2, Sempron] HyperTransport Configuration (rev 40)
00:18.1 Host bridge: Advanced Micro Devices [AMD] Family 11h [Turion
X2, Athlon X2, Sempron] Address Map
00:18.2 Host bridge: Advanced Micro Devices [AMD] Mobile K10 [Turion
X2, Athlon X2, Sempron] DRAM Controller
00:18.3 Host bridge: Advanced Micro Devices [AMD] Mobile K10 [Turion
X2, Athlon X2, Sempron] Miscellaneous Control
00:18.4 Host bridge: Advanced Micro Devices [AMD] Mobile K10 [Turion
X2, Athlon X2, Sempron] Link Control
01:05.0 VGA compatible controller: ATI Technologies Inc RS780M/RS780MN
[Radeon HD 3200 Graphics]
03:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5764M
Gigabit Ethernet PCIe (rev 10)
06:00.0 Network controller: Atheros Communications Inc. AR928X
Wireless Network Adapter (PCI-Express) (rev 01)
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