Hello, I had the same result, only first boot up can connect to wireless network on my lenovo X200 , after about one minutes, fail the connection the following is /var/log/syslog, my home wireless network use WEP 64.
I compile from "rtl8192se_linux_2.6.0014.0115.2010" downloaded from RealTek's web site.
the version of kernel I use is 
terry_x200:~# uname -a
Linux terry_x200 2.6.32-trunk-amd64 #1 SMP Sun Jan 10 22:40:40 UTC 2010 x86_64 GNU/Linux


[   34.311666] [drm] LVDS-8: set mode  1a
[ 1569.742485] rtllib_crypt: registered algorithm 'NULL'
[ 1569.742487] rtllib_crypt: registered algorithm 'TKIP'
[ 1569.742489] rtllib_crypt: registered algorithm 'CCMP'
[ 1569.742491] rtllib_crypt: registered algorithm 'WEP'
[ 1569.742492] 
[ 1569.742493] Linux kernel driver for RTL8192 based WLAN cards
[ 1569.742494] Copyright (c) 2007-2008, Realsil Wlan Driver
[ 1569.742537] rtl819xSE 0000:03:00.0: PCI INT A -> GSI 17 (level, low) -> IRQ 17
[ 1569.742545] rtl819xSE 0000:03:00.0: setting latency timer to 64
[ 1569.742741] Adapter(8192SE) is found - DeviceID=8172
[ 1569.766379] rtl819xSE 0000:03:00.0: firmware: requesting RTL8192SE/rtl8192sfw.bin
[ 1569.903452] rtl8192_SetWirelessMode(), wireless_mode:10, bEnableHT = 1
[ 1569.913111] ===>rtllib_start_scan()
[ 1569.913416] ADDRCONF(NETDEV_UP): wlan0: link is not ready
[ 1574.221944] alg name:WEP
[ 1574.302880] Linking with DIGEZ,channel:11, qos:0, myHT:1, networkHT:0, mode:6 cur_net.flags:0x406
[ 1574.302903] Linking with DIGEZ,channel:11, qos:0, myHT:1, networkHT:0, mode:6 cur_net.flags:0x406
[ 1574.303068] ===>rtllib_associate_procedure_wq(), chan:11
[ 1574.303074] HTSetConnectBwMode():pHTInfo->bCurBW40MHz:0
[ 1574.333191] rtllib_authentication_req():auth->algorithm is OPEN
[ 1574.335032] rtl8192_SetWirelessMode(), wireless_mode:4, bEnableHT = 0
[ 1574.337565] Associated successfully
[ 1574.337569] normal associate
[ 1574.337587] Using G rates:108
[ 1574.337592] Successfully associated, ht not enabled(0, 0)
[ 1574.339341] ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[ 1575.912498] dm_check_edca_turbo():iot peer is unknown, bssid:00:1d:73:3a:99:25
[ 1576.470130] DHCP pkt src port:68, dest port:67!!
terry_x200:/lib/modules/2.6.32-trunk-amd64/kernel/drivers/net/wireless# tail -f /var/log/syslog 
Mar  9 22:43:01 (none) kernel: [ 1630.072104] LPS leave: notify AP we are awaked ++++++++++ SendNullFunctionData
Mar  9 22:43:01 (none) kernel: [ 1630.074356] rtl819xSE:[FW CMD] Set FW Cmd fail!!
Mar  9 22:43:01 (none) kernel: [ 1630.074356] 
Mar  9 22:43:01 (none) kernel: [ 1630.074356] rtl819xSE:[FW CMD] Set FW Cmd fail!!
Mar  9 22:43:01 (none) kernel: [ 1630.074356] 
Mar  9 22:43:01 (none) kernel: [ 1630.074356] rtl819xSE:[FW CMD] Set FW Cmd fail!!
Mar  9 22:43:01 (none) kernel: [ 1630.074356] 
Mar  9 22:43:08 (none) kernel: [ 1637.164054] ----------->rtl8192se_check_hw_scan()
Mar  9 22:43:08 (none) kernel: [ 1637.164062] FW Scan long time without stop, stop hw scan
Mar  9 22:43:08 (none) kernel: [ 1637.165070] <-----------rtl8192se_check_hw_scan()
Mar  9 22:43:57 (none) dhclient: receive_packet failed on wlan0: Network is down
Mar  9 22:43:57 (none) NetworkManager: <info>  (wlan0): supplicant connection state:  completed -> disconnected