Sinds some weeks i running here a Samsung Galaxy Note 7 with Android version 7.1.1 (17-2-2018)
Downloaded in the Android Goolge Play Store the Kenwood Nano app and where facing some audio problems in the beginning. TX audio where fine to the outside world. RX audio where there and seem to having some digital package failures. Finaly i found out that my settings in the RRC-1258MkII box with software version 2.91 has to be changed at the radio settings tab. From Program mode number 8 TS-2000/TM-D700 into number 4 Yaesu, Kenwood, Elecraft.
Into Program mode 4 - Yaesu, Kenwood, Elecraft is my audiostream without notifying problems in combination with the Kenwood TS-2000 and Kenwood Nano app version 1.5.1 on Wifi, 3G-4G, telecom provider.
(I don`t know if this make any difference. I don`t installed any kind of antivirus programs on my phone)
73 Dimi