Check if any special characters such as #, &, % or any national characters are part of your WPA/WPA2 Network Password.
If this is the case, then change your password to one that doesn't include these characters. The same applies to your Speaker Name and Wireless Network Name (SSID) which must also contain alphanumeric characters only. The latest Libratone speaker firmware - released February 5th 2013 - accepts most special characters though.
For instructions on how to change the configuration of your router, please refer to your router's documentation.