Default [Q]Does anyone know why the Tethering or hotspot can be turned on automatically?

When I am using a Bluetooth earphone, and turn on the WIFI, the WIFI will be turned off by itself after several seconds. And then the Tethering or hotspot is active. If I don't turn on the Bluetooth, it won't occur.
So, I think maybe the Bluetooth can make the Tethering or hotspot to be active, and then force turn off the WIFI. That means I can't turn on the Bluetooth and WIFI at the same time !!!!
Have anyone ever met this issue ?? Anyone who knows how to fix it ?