To anyone who has Samsung products, please review the following link and information:
Samsung acknowledges Galaxy S4 wi-fi connection problemIf anyone is experiencing this problem and need immediate help, please contact Samsung directly for help and information.
Please post your information in the appropriate model router forum that you have and we can try some trouble shooting steps to see if we can get a work around in place. D-Link is aware of it and is working with Samsung to help them resolve the issue.
Thank you.