i have been experiencing airdrop reverting itself to "receiving off", too, on my iphone xs. After two days of searching i found something that fixed it. If you are on ios13 (i'm on 13.4.1) trying to airdrop say videos and pics to your macbook,
and airdrop in finder doesn't see your phone,
or it does, but the transfer failed or sat there forever not responding,
and airdrop keeps reverting itself to "receiving off" by itself
then try this, it fixed it for me.
hard reset your iphone by
Hard restart the iphone xs by
click volume up button
click volume down button then
hold in the side button and continue to hold it all the way through the power off screen until you see the apple logo.
This allowed me to set the airdrop visibility to "everyone" which is what I wanted. It fixed airdrop from putting itself back on "receiving only" over and over and over.