I too have this problem.  I have a Samsung R620 with a RealTek 8192E and
Ndiswrapper runs OK until I transfer a large file.  It usually fails
quickly - after a few tens of Mb transferred.

If I open the Windows Wireless Drivers control panel and remove then re-
add the WinXP driver then the wifi comes back to life.  Until it dies
again.

** uname -a:

Linux kreacher 2.6.31-17-generic #54-Ubuntu SMP Thu Dec 10 16:20:31 UTC
2009 i686 GNU/Linux

** lspci -vvnn:

02:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. Device 
[10ec:8192] (rev 01)
        Subsystem: Askey Computer Corp. Device [144f:7160]
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR- FastB2B- DisINTx-
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- 
<MAbort- >SERR- <PERR- INTx-
        Latency: 0, Cache Line Size: 64 bytes
        Interrupt: pin A routed to IRQ 16
        Region 0: I/O ports at 3000 [size=256]
        Region 1: Memory at f6000000 (32-bit, non-prefetchable) [size=16K]
        Capabilities: [40] Power Management version 3
                Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=375mA 
PME(D0-,D1+,D2+,D3hot+,D3cold-)
                Status: D0 PME-Enable- DSel=0 DScale=0 PME-
        Capabilities: [50] Message Signalled Interrupts: Mask- 64bit+ Queue=0/0 
Enable-
                Address: 0000000000000000  Data: 0000
        Capabilities: [70] Express (v1) Legacy Endpoint, MSI 00
                DevCap: MaxPayload 256 bytes, PhantFunc 0, Latency L0s <128ns, 
L1 <2us
                        ExtTag- AttnBtn- AttnInd- PwrInd- RBE+ FLReset-
                DevCtl: Report errors: Correctable- Non-Fatal- Fatal- 
Unsupported-
                        RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop-
                        MaxPayload 128 bytes, MaxReadReq 512 bytes
                DevSta: CorrErr+ UncorrErr- FatalErr- UnsuppReq+ AuxPwr- 
TransPend-
                LnkCap: Port #0, Speed 2.5GT/s, Width x1, ASPM L0s L1, Latency 
L0 <512ns, L1 <64us
                        ClockPM+ Suprise- LLActRep- BwNot-
                LnkCtl: ASPM L0s L1 Enabled; RCB 64 bytes Disabled- Retrain- 
CommClk+
                        ExtSynch- ClockPM+ AutWidDis- BWInt- AutBWInt-
                LnkSta: Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk+ 
DLActive- BWMgmt- ABWMgmt-
        Capabilities: [100] Advanced Error Reporting <?>
        Capabilities: [140] Virtual Channel <?>
        Capabilities: [160] Device Serial Number 00-24-d2-ff-fe-b5-40-9e
        Kernel driver in use: ndiswrapper

** lshw -C network:

  *-network DISABLED      
       description: Wireless interface
       product: Realtek Semiconductor Co., Ltd.
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: p...@0000:02:00.0
       logical name: wlan0
       version: 01
       serial: 00:24:d2:b5:40:9e
       width: 32 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list ethernet physical 
wireless
       configuration: broadcast=yes driver=ndiswrapper+net819xp 
driverversion=1.55+Realtek Semiconductor Corp. latency=0 link=no multicast=yes 
wireless=IEEE 802.11g
       resources: irq:16 ioport:3000(size=256) memory:f6000000-f6003fff
  *-network
       description: Ethernet interface
       product: Marvell Technology Group Ltd.
       vendor: Marvell Technology Group Ltd.
       physical id: 0
       bus info: p...@0000:06:00.0
       logical name: eth0
       version: 10
       serial: 00:13:77:ff:1e:12
       size: 100MB/s
       capacity: 1GB/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list rom ethernet 
physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=sky2 
driverversion=1.23 duplex=full firmware=N/A ip=192.168.1.103 latency=0 link=yes 
multicast=yes port=twisted pair speed=100MB/s
       resources: irq:29 memory:fa000000-fa003fff ioport:5000(size=256) 
memory:f4000000-f401ffff(prefetchable)

-- 
Wireless connection lost during heavy network load.
https://bugs.launchpad.net/bugs/190144
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