pc: acer one 522
problem: wireless unstable --> repeatedly (3-4 times) connects for 5-6 sec then out of the blue disconnects.

sudo ifconfig
eth0      Link encap:Ethernet  HWaddr 1c:75:08:de:da:a0  
          inet addr:192.168.2.17  Bcast:192.168.2.255  Mask:255.255.255.0
          inet6 addr: fe80::1e75:8ff:fede:daa0/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:3202 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1165 errors:0 dropped:0 overruns:0 carrier:1
          collisions:0 txqueuelen:1000 
          RX bytes:1231201 (1.2 MB)  TX bytes:162721 (162.7 KB)
          Interrupt:41 

eth1      Link encap:Ethernet  HWaddr ec:55:f9:24:47:97  
          inet6 addr: fe80::ee55:f9ff:fe24:4797/64 Scope:Link
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:6992
          TX packets:122 errors:23 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:28845 (28.8 KB)
          Interrupt:19 

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:160 errors:0 dropped:0 overruns:0 frame:0
          TX packets:160 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:12208 (12.2 KB)  TX bytes:12208 (12.2 KB)

sudo iwconfig
lo        no wireless extensions.

eth0      no wireless extensions.

eth1      IEEE 802.11  ESSID:""  
          Mode:Managed  Frequency:2.427 GHz  Access Point: Not-Associated   
          Bit Rate:72 Mb/s   Tx-Power:24 dBm   
          Retry min limit:7   RTS thr:off   Fragment thr:off
          Power Management:off
          Link Quality=5/5  Signal level=0 dBm  Noise level=-86 dBm
          Rx invalid nwid:0  Rx invalid crypt:106  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0

sudo iwlist eth1 scan
eth1      Scan completed :
          Cell 01 - Address: 00:26:50:B3:59:69
                    ESSID:"BELL864"
                    Mode:Managed
                    Frequency=2.427 GHz (Channel 4)
                    Quality:5/5  Signal level:-24 dBm  Noise level:-89 dBm
                    Encryption key:on
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 6 Mb/s; 9 Mb/s
                              11 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s
                              48 Mb/s; 54 Mb/s

connection file shows the ssid scanned as well as the proper keys.

lspci -k -nn -d 14e4:4727
07:00.0 Network controller [0280]: Broadcom Corporation BCM4313 802.11b/g/n Wireless LAN Controller [14e4:4727] (rev 01)
	Subsystem: Broadcom Corporation Device [14e4:0510]
	Kernel driver in use: wl
	Kernel modules: wl, bcma, brcmsmac

wifi light is ON

/etc/udev/rules.d/70-persistent-net.rules

# This file was automatically generated by the /lib/udev/write_net_rules
# program, run by the persistent-net-generator.rules rules file.
#
# You can modify it, as long as you keep each rule on a single
# line, and change only the value of the NAME= key.

# PCI device 0x1969:0x2062 (atl1c)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="1c:75:08:de:da:a0", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"

# PCI device 0x14e4:0x4727 (brcmsmac)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="ec:55:f9:24:47:97", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="wlan*", NAME="wlan0"

# PCI device 0x14e4:0x4727 (wl)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="ec:55:f9:24:47:97", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth1"

question pls : are last 2 rules for same device and address and different kernel module ok ?

brcmsmac module is not used. lsmod lists only wl module.