I have iOS 11.2.2 Installed on an iPhone 8. Periodically, someone will try to send me something via AirDrop and it’s turned off. I NEVER turn it off. I never turn off Bluetooth. I do sometimes turn off Wi-Fi in order to disconnect from my home Wi-Fi when I’m driving away but I turn it back on after. When I find AirDrop turned off, I always turn it back on and then a few days later, I’ll try to use it and it’s off again. What could be causing this??