Losing internet connection randomly (wlan stays connected) - wicd

Since about a week now I'm running into endless problems with my wlan connection - before that, all worked well (I didn't changed any hardware)
I'm losing my internet connection in random intervals and I can't track down the reason for this problem. I've a dual-boot setup with win7 on it and there I have constant connection so this can't be any hardware problem.
I am using wicd to manage my wlan (wicd-kde, wicd-curses).
always used dhcp and never made any problems -even tried with static IP now which unfortunately didn't help.
One thing to mention - even if I'm connected, the connection seems very slow, compared to the laptop I'm on (in the same network).
now some console output:
lspci | grep -i net
02:00.0 Ethernet controller: Marvell Technology Group Ltd. 88E8056 PCI-E Gigabit Ethernet Controller (rev 12)
05:02.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 10)
(both on-board - lan is not used - just wlan)
sudo tail -1 /etc/rc.conf
DAEMONS=(!hwclock dbus syslog-ng !network !netfs crond wicd postfix sshd)
iwconfig wlan0
wlan0 IEEE 802.11bg ESSID:"Schnulli"
Mode:Managed Frequency:2.437 GHz Access Point: 00:1E:69:9F:22:3F
Bit Rate=18 Mb/s Tx-Power=20 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Power Management:off
Link Quality=44/70 Signal level=-66 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:4238 Invalid misc:6580 Missed beacon:0
ifconfig wlan0
wlan0 Link encap:Ethernet HWaddr 00:15:AF:0F:C8:48
inet addr:192.168.0.12 Bcast:192.168.0.255 Mask:255.255.255.0
inet6 addr: fe80::215:afff:fe0f:c848/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:20308 errors:0 dropped:0 overruns:0 frame:0
TX packets:16695 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:24970986 (23.8 Mb) TX bytes:2037458 (1.9 Mb)
/var/log/wicd/wicd.log:
2011/07/18 15:53:39 :: ---------------------------
2011/07/18 15:53:39 :: wicd initializing...
2011/07/18 15:53:39 :: ---------------------------
2011/07/18 15:53:39 :: wicd is version 1.7.0 552
2011/07/18 15:53:40 :: setting backend to external
2011/07/18 15:53:40 :: trying to load backend external
2011/07/18 15:53:40 :: successfully loaded backend external
2011/07/18 15:53:40 :: trying to load backend external
2011/07/18 15:53:40 :: successfully loaded backend external
2011/07/18 15:53:40 :: Automatically detected wireless interface wlan0
2011/07/18 15:53:40 :: setting wireless interface wlan0
2011/07/18 15:53:40 :: automatically detected wired interface eth0
2011/07/18 15:53:40 :: setting wired interface eth0
2011/07/18 15:53:40 :: setting wpa driver wext
2011/07/18 15:53:40 :: setting use global dns to False
2011/07/18 15:53:40 :: setting global dns
2011/07/18 15:53:40 :: global dns servers are None None None
2011/07/18 15:53:40 :: domain is None
2011/07/18 15:53:40 :: search domain is None
2011/07/18 15:53:40 :: setting automatically reconnect when connection drops True
2011/07/18 15:53:40 :: Setting dhcp client to 0
2011/07/18 15:53:40 :: Wireless configuration file found...
2011/07/18 15:53:40 :: Wired configuration file found...
2011/07/18 15:53:40 :: chmoding configuration files 0600...
2011/07/18 15:53:40 :: chowning configuration files root:root...
2011/07/18 15:53:40 :: Using wireless interface...wlan0
2011/07/18 15:53:40 :: Using wired interface...eth0
2011/07/18 15:53:44 :: hidden
2011/07/18 15:53:45 :: Autoconnecting...
2011/07/18 15:53:47 :: No wired connection present, attempting to autoconnect to wireless network
2011/07/18 15:53:49 :: hidden
2011/07/18 15:53:49 :: trying to automatically connect to...Schnulli
2011/07/18 15:53:49 :: Connecting to wireless network Schnulli
2011/07/18 15:53:51 :: Putting interface down
2011/07/18 15:53:51 :: Releasing DHCP leases...
2011/07/18 15:53:51 :: Setting false IP...
2011/07/18 15:53:53 :: Stopping wpa_supplicant
2011/07/18 15:53:53 :: Flushing the routing table...
2011/07/18 15:53:53 :: Putting interface up...
2011/07/18 15:53:55 :: Generating psk...
2011/07/18 15:53:55 :: Attempting to authenticate...
2011/07/18 15:53:58 :: Running DHCP with hostname blub
2011/07/18 15:53:58 :: dhcpcd[1333]: version 5.2.12 starting
2011/07/18 15:53:58 ::
2011/07/18 15:53:59 :: dhcpcd[1333]: wlan0: rebinding lease of 192.168.0.12
2011/07/18 15:53:59 ::
2011/07/18 15:54:00 :: dhcpcd[1333]: wlan0: acknowledged 192.168.0.12 from 192.168.0.1
2011/07/18 15:54:00 ::
2011/07/18 15:54:00 :: dhcpcd[1333]: wlan0: checking for 192.168.0.12
2011/07/18 15:54:00 ::
2011/07/18 15:54:05 :: dhcpcd[1333]: wlan0: leased 192.168.0.12 for 604800000 seconds
2011/07/18 15:54:05 ::
2011/07/18 15:54:06 :: dhcpcd[1333]: forked to background, child pid 1388
2011/07/18 15:54:06 ::
2011/07/18 15:54:06 ::
2011/07/18 15:54:06 :: DHCP connection successful
2011/07/18 15:54:06 :: not verifying
2011/07/18 15:54:06 :: Connecting thread exiting.
2011/07/18 15:54:09 :: Sending connection attempt result Success
really don't know what to do now - help is very much appreciated!
thanks in advance

Thanks for you answer!
Actually, I tried it with dhclient too and it didn't helped at all.
I switched to netcfg(2) now and it seems working - wicd is completely removed from my system - hopefully it will stay like this now.
the only problem for now is that my connection seems quite slow - any ideas where/how I can track down possible issues?
still I've no idea what was/is causing those problems since in win7 all works well..

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Press the 'Accept As Solution' icon if I have solved your problem, click on the Star Icon below if my advice has helped you!

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