WOWLAN with OpenVPN stops working after a few minutes

Simple, I want to WOWLAN. I already have WOL working with the app/software WOLOW companion. I setup OPENVPN on my router and got it connected to my phone, so when I connect to the VPN my public IP is the same as my home-network. However WOWLAN stops working after roughly 5 min when my computer has been turned off whilst WOLAN works every time no matter how long the computer has been turned off for. Additionally WOLAN works through the broadcast address sent from my computers network card whilst WOWLAN only works when sent directly to the network card. So really the main problem is why WOWLAN s

Question by nisse26a on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.