Sony has done a huge mistake
I bought the STR DN 1080 and the connectivity with this app simply does not work via Wifi. It is constantly being lost. I sent the device to Sony Slovenia and Germany, they returned it, saying everything is OK. I use other devices that work perfectly on my home network so the reason is Sony. I hope their updates one day will solve the issues... untill then my device is for sale. My advice is: avoid Sony if you want a seamless wifi and bluetooth control.