Android Scanner not working after SCREEN OFF

Hello

I follow the samples and have a working app to scan barcodes on two different activities.

If the TC51 is connected via cable, everything is working fine.

*) Scanning in Activity 1

*) Scanning in Activity 2

*) Screen OFF (hardware button: off)

*) Screen ON (hardware button: on)

*) Scanning in Activity 2

*) Scanning in Activity 1

=> works

If the TC51 is NOT connected via cable, after Screen ON event I get no scan result

*) Scanning in Activity 1

*) Scanning in Activity 2

*) Screen OFF (hardware button: off)

*) Screen ON (hardware button: on)

*) Scanning in Activity 2 NOT WORKING scanner state log output seems to be correct

*) Scanning in Activity 1 NOT WORKING scanner state log output seems to be correct

If i have a valid scan i see two lights on top of the device (one smaller orange one, one bigger red one)

If i turn the screen off without connected cable only the smaller organge one is visible - the other one is not working. To get the second one working I have to restart the app.

What can be the reason for this behavior?