Bluetooth that only connects 70% of the time. Usually just turning bluetooth on and then turning the speaker on works, but sometimes it doesn't. There's no reason it shouldn't work. One device is set to send signals, the other is set to catch signals. But no, you have to solve a puzzle. Sometimes you just have to turn one of them off and then on again. Sometimes you have to turn both off and on again. Sometimes neither works, and you have to connect to something else and then come back again.
I wish whatever fuckin nerd came up with bluetooth would have followed through and made it work the way it's supposed to.