I'm connecting a CS4070 scanner (let's say Scanner-1) with scanner control app on Android via Bluetooth. It gets connected and works properly. Now I connect another CS4070 scanner (Scanner-2) and it too gets connected and works properly. Scanner-1 gets disconnected because of this which is expected.

I leave Scanner-2 connected to scanner control app and after some time Scanner-1 turns off, which is again expected. Now after some time, I turn Scanner-1 back on while scanner control app is connected to Scanner-2. I hear the connection beep on Scanner-1 as it turns on but scanner control app is connected to Scanner-2 still.

And now even if I try to connect to Scanner-1 explicitly from scanner control app, then it tries to connect but fails to do so. Now please bear in mind that this doesn't happen all the time and happens only with more than one scanner. Most of the times it works correctly. You'll have to do these steps a few times to reproduce this issue.