MBP - have to re-enable Wi-Fi every 30 mins
You can run a Cron action who turn on/off your wifi connection every 30 minutes ;)

Turn Wifi Off

networksetup -setairportpower en0 off


Turn Wifi On

networksetup -setairportpower en0 on


http://blog.mattcrampton.com/post/64144666914/managing-wifi-connections-using-the-mac-osx

Schedule a Cron task :

http://benr75.com/pages/using_crontab_mac_os_x_unix_linux

Edit : Ohh sorry I was thinking that you wanted to turn on/off your wifi every 30 minutes :/ However, if you don't find a solution...