Satellite L350 - WiFi RTL8187B drops

Hi,
I have a problem with my Toshiba L350-16L(PSLD8E-00C00GG3).
The build in WiFi adapter - "Realtek RTL8187B Wireless 802.11b/g 54Mbps USB 2.0 Network Adapter" drops the connection without any reason.
I am using Windows Vista Home Premium which came with the notebook.
I've tried several drivers for this adapter but no change.
Sometimes the connection drops and Vista says "Windows cannot find any network" - with the other computer I have about 5 visible networks.
Other times I see all the available networks but I can't connect them. The signal strength of my wireless router is excellent according to the indication.
The problem disappears for a while when I disable/enable the adapter, but sometimes the card even can't be disabled and I have to restart the computer - of course it freezes at shutting down screen and I have to push the power button for 3 seconds....
Sometimes the problem appears after 30 minutes, but sometimes after 1 minute again and again.
Do you have any ideas?
Thanks!
Best Regards,

Hi,
I have the same problem with my new laptop Toshiba Satellite L300 PSL8B8E. I purchased it 3 days ago. I have build in WiFi adapter Realtek RTL8187B Wireless 802.11b/g 54Mbps USB 2.0.
1. I tried to reinstall Windows Vista Home Premium from scratch.
2. I have downloaded drivers from Toshiba download site.
3. I disabled Power saving options.
4. Bios is the latest version
None of this helped me to solve problem with freezing Wifi. After restart it's working for a while and then it stop communicate and nothing helps me until I restart operating system.
Can anybody help me?
Zoltan

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