With the newest distribution, beginning yesterday, both of the Ubuntu computers on my network that connect via wireless are randomly dropping the connection several times an hour. The connection re-establishes in a few seconds, but it interrupts downloads, browsing, and updates. The Windows computer connected via Ethernet is not affected by these outages. This didn't happen during the previous several weeks where I had the 12.04 Beta version installed; only beginning yesterday with the new distro. In fact, the connection dropped twice while I was typing this.

sudo lshw -class network returns:

 *-network               

   description: Wireless interface

   product: BCM4321 802.11a/b/g/n

   vendor: Broadcom Corporation

   physical id: 0

   bus info: pci@0000:0c:00.0

   logical name: eth3

   version: 01

   serial: 00:16:cf:c9:36:50

   width: 64 bits

   clock: 33MHz

   capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless

   configuration: broadcast=yes driver=wl0 driverversion=5.100.82.38 ip=192.168.0.2 latency=0 multicast=yes wireless=IEEE 802.11abgn

   resources: irq:17 memory:efdfc000-efdfffff memory:e0000000-e00fffff

 *-network

   description: Ethernet interface

   product: BCM4401-B0 100Base-TX

   vendor: Broadcom Corporation

   physical id: 0

   bus info: pci@0000:03:00.0

   logical name: eth2

   version: 02

   serial: 00:18:8b:ab:dc:fd

   size: 10Mbit/s

   capacity: 100Mbit/s

   width: 32 bits

   clock: 33MHz

   capabilities: pm bus_master cap_list ethernet physical mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation

   configuration: autonegotiation=on broadcast=yes driver=b44 driverversion=2.0 duplex=half latency=64 link=no multicast=yes port=twisted pair speed=10Mbit/s

   resources: irq:17 memory:ef9fe000-ef9fffff

lsusb returns:

Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

Bus 001 Device 002: ID 413c:a005 Dell Computer Corp. Internal 2.0 Hub

Bus 001 Device 003: ID 0a5c:4500 Broadcom Corp. BCM2046B1 USB 2.0 Hub (part of BCM2046 Bluetooth)

Bus 001 Device 004: ID 413c:8126 Dell Computer Corp. Wireless 355 Bluetooth

Bus 001 Device 005: ID 0a5c:4502 Broadcom Corp. Keyboard (Boot Interface Subclass)

Bus 001 Device 006: ID 0a5c:4503 Broadcom Corp. Mouse (Boot Interface Subclass)

lspci returns:

00:00.0 Host bridge: Intel Corporation Mobile 945GM/PM/GMS, 943/940GML and 945GT Express Memory Controller Hub (rev 03)

00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller (rev 03)

00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, 943/940GML Express Integrated Graphics Controller (rev 03)

00:1b.0 Audio device: Intel Corporation N10/ICH 7 Family High Definition Audio Controller (rev 01)

00:1c.0 PCI bridge: Intel Corporation N10/ICH 7 Family PCI Express Port 1 (rev 01)

00:1c.1 PCI bridge: Intel Corporation N10/ICH 7 Family PCI Express Port 2 (rev 01)

00:1c.3 PCI bridge: Intel Corporation N10/ICH 7 Family PCI Express Port 4 (rev 01)

00:1d.0 USB controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #1 (rev 01)

00:1d.1 USB controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #2 (rev 01)

00:1d.2 USB controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #3 (rev 01)

00:1d.3 USB controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #4 (rev 01)

00:1d.7 USB controller: Intel Corporation N10/ICH 7 Family USB2 EHCI Controller (rev 01)

00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev e1)

00:1f.0 ISA bridge: Intel Corporation 82801GBM (ICH7-M) LPC Interface Bridge (rev 01)

00:1f.2 IDE interface: Intel Corporation 82801GBM/GHM (ICH7-M Family) SATA Controller [IDE mode] (rev 01)

00:1f.3 SMBus: Intel Corporation N10/ICH 7 Family SMBus Controller (rev 01)

03:00.0 Ethernet controller: Broadcom Corporation BCM4401-B0 100Base-TX (rev 02)

03:01.0 FireWire (IEEE 1394): Ricoh Co Ltd R5C832 IEEE 1394 Controller

03:01.1 SD Host controller: Ricoh Co Ltd R5C822 SD/SDIO/MMC/MS/MSPro Host Adapter (rev 19)

03:01.2 System peripheral: Ricoh Co Ltd R5C592 Memory Stick Bus Host Adapter (rev 0a)

03:01.3 System peripheral: Ricoh Co Ltd xD-Picture Card Controller (rev 05)

0c:00.0 Network controller: Broadcom Corporation BCM4321 802.11a/b/g/n (rev 01)

rfkill list all returns:

0: brcmwl-0: Wireless LAN

    Soft blocked: no

    Hard blocked: no

1: dell-wifi: Wireless LAN

    Soft blocked: no

    Hard blocked: no

2: dell-bluetooth: Bluetooth

    Soft blocked: no

    Hard blocked: no

3: hci0: Bluetooth

    Soft blocked: no

    Hard blocked: no

I admit, I don't know what to do with any of this. All I know is until yesterday, my connection stayed steady, and with the update, it keeps dropping and reconnecting.