I've got a Master mode WIFI as access point. In same radio, I've added Client Mode to connect to and get internet access (mobile phone).
If the client is connected, all works fine. But when it loose mobile, Master stop emitting.
Model: TP-Link TL-WR841N/ND v12
Architecture: Qualcomm Atheros QCA9533 ver 2 rev 0
Firmware Version: OpenWrt 18.06.1 r7258-5eb055306f / LuCI openwrt-18.06 branch (git-18.228.31946-f64b152)
Kernel Version: 4.9.120