Recommended wireless settings for your wireless access point or router, settings that BoxeeBox will potentially have less troubles with are -
WPA2-PSK + AES
Several users have reported issues with BB when the AP/router was configured with TKIP - http://forums.boxee.tv/showthread.php?t=23117.
Until we resolve this issue we recommend to use WPA2-PSK + AES
If you change your router/AP settings, don't forget to make sure all your other wireless network client - PCs/laptops/streamers/NASs/.. - are still connected and that there's no need to change their settings.
If you have any problem, please add to your problem description your router/AP settings + model an the way Boxee was configured.
Thanks for your patience and cooperation,