I've got two Sesame door locks installed and because there are multiple people in my household, we have 4 different android phones.
However, one of the Sesame's is currently reporting "Busy" "Sesame is currently working for another user" and has been in that state for the last 6 hours. I cannot connect to it and the auto lock feature doesn't work while it's in this state. Pressing the reset button leaves the lock in a disconnected state which it won't come out of unless you remove and re-add the lock.
THE FIX: Turn Bluetooth off and then on again on each device until the offending phone is isolated. You can then make sure to turn off Bluetooth once you've finished locking/unlocking the unit OR remove the cover and then remove a battery to cut the power to the unit. Put the battery back in and it should be fine.... Until the next time it happens...
I can't keep doing this for my family... Can you include some kind of timeout if no input is received? If you haven't locked/unlocked the lock in say 15 seconds... You probably don't need exclusive use of the sesame lock.
EDIT: the phone in question was an Oppo R9S Plus. When you change focus from the Sesame app to anything else, the phone (by default) immediately suspends the app. I'll do some further testing this weekend.