Thank you for your post. The troubleshooting you describe is actually all you can do; there are no settings that can cause this error message. The only thing you can try if you haven’t already is to set the power options of your laptop for maximum performance, this to make sure that it will not turn off the adapter while the system is idle.
This wireless adapter is mature product, and its support ended in December 2009, the issue is that it may be beginning to fail. There are also no replacements for this adapter, (no miniPCI WiFi cards are manufactured anymore) you might need to look for an alternative solution like a USB wireless adapter.
Just in case see below the support page and drivers for this adapter:
Product support page: