Photon not disconnecting if we disconnect internet while connected

Hi,

We are facing this issue with PUN. While game is running and if we disconnect internet, we don't get disconnect callbacks and game keeps running.

PUN + 1.73
Unity 5.4.2p2

Steps to reproduce
1. Connect your device or machine to a wifi
2. Once inside room, remove internet cable from your router or if you are using android device just pull down setting and switch off wifi.

Notice that app doesn't get disconnected. We have set background time out and app disconnect time out to 10seconds.

Thanks