I'm seeing the same issue-wireless works for a while, then shuts down. I have a Dell D620 with the Broadcom 4311, using the 686 kernel and nvidia driver. I also added the line:

blacklist bcm43xx
 
to /etc/modprobe.d/blacklist in case there was a conflict with the native Broadcom driver, which doesn't yet work with this chip, but that didn't help. TIA for any help!

Here is the dmesg output:

[17179588.252000] ndiswrapper version 1.23 loaded (preempt=yes,smp=yes)
[17179588.320000] ndiswrapper: driver bcmwl5 (Broadcom,11/02/2005, 4.10.40.0) loaded
[17179588.320000] ACPI: PCI Interrupt 0000:0c:00.0[A] -> GSI 17 (level, low) -> IRQ 177
[17179588.320000] PCI: Setting latency timer of device 0000:0c:00.0 to 64
[17179588.324000] ndiswrapper: using irq 177
[17179588.980000] wlan0: vendor: ''
[17179588.980000] wlan0: ethernet device 00:16:ce:8e:c7:47 using NDIS driver bcmwl5, 14E4:4311.5.conf
[17179588.980000] wlan0: encryption modes supported: WEP; TKIP with WPA, WPA2, WPA2PSK; AES/CCMP with WPA, WPA2, WPA2PSK
[17179594.152000] NET: Registered protocol family 10
[17179594.152000] lo: Disabled Privacy Extensions
[17179594.152000] IPv6 over IPv4 tunneling driver
[17179596.224000] ACPI: AC Adapter [AC] (on-line)
[17179596.248000] ACPI: Battery Slot [BAT0] (battery present)
[17179596.248000] ACPI: Battery Slot [BAT1] (battery absent)
[17179596.336000] ACPI: Lid Switch [LID]
[17179596.336000] ACPI: Power Button (CM) [PBTN]
[17179596.336000] ACPI: Sleep Button (CM) [SBTN]
[17179596.428000] ibm_acpi: ec object not found
[17179596.472000] pcc_acpi: loading...
[17179596.560000] ACPI: Video Device [VID] (multi-head: yes  rom: no  post: no)
[17179596.560000] ACPI: Video Device [VID] (multi-head: yes  rom: no  post: no)
[17179596.560000] ACPI: Video Device [VID2] (multi-head: yes  rom: no  post: no)[17179602.680000] ppdev: user-space parallel port driver
[17179603.212000] apm: BIOS not found.
[17179604.228000] eth0: no IPv6 routers present
[17179604.828000] wlan0: no IPv6 routers present
[17179607.160000] Bluetooth: Core ver 2.8
[17179607.160000] NET: Registered protocol family 31
[17179607.160000] Bluetooth: HCI device and connection manager initialized
[17179607.160000] Bluetooth: HCI socket layer initialized
[17179607.216000] Bluetooth: L2CAP ver 2.8
[17179607.216000] Bluetooth: L2CAP socket layer initialized
[17179607.240000] Bluetooth: RFCOMM socket layer initialized
[17179607.240000] Bluetooth: RFCOMM TTY layer initialized
[17179607.240000] Bluetooth: RFCOMM ver 1.7
[17179624.524000] eth0: no IPv6 routers present
[17179913.992000] ibm_acpi: ec object not found
[17180234.540000] irq 177: nobody cared (try booting with the "irqpoll" option)
[17180234.540000]  [<c014fc8a>] __report_bad_irq+0x2a/0xa0
[17180234.540000]  [<c014f44d>] handle_IRQ_event+0x3d/0x70
[17180234.540000]  [<c014fda7>] note_interrupt+0x87/0xf0
[17180234.540000]  [<c014f57d>] __do_IRQ+0xfd/0x110
[17180234.540000]  [<c0105c79>] do_IRQ+0x19/0x30
[17180234.540000]  [<c0103eb6>] common_interrupt+0x1a/0x20
[17180234.540000]  [<f8872f35>] acpi_processor_idle+0x21e/0x32d [processor]
[17180234.540000]  [<c010111f>] cpu_idle+0x6f/0xc0
[17180234.540000]  [<c03aca3f>] start_kernel+0x19f/0x200
[17180234.540000]  [<c03ac3c0>] unknown_bootoption+0x0/0x1f0
[17180234.540000] handlers:
[17180234.540000] [<f8d269a0>] (ndis_isr+0x0/0xd0 [ndiswrapper])
[17180234.540000] Disabling IRQ #177
j