Motorola ET1 Phonegap app and Scanner fails at random times

We are using the Motorola Et1 with Android 4.1.1 and the Standard Browser or a Corodova App (Same things happen on both Scenarios).

 

After a some time the scanner holds in the current position, Scan all the time or do nothing if the Scanbutton is triggered.

The only Solution is to Hardreset the Device, a restart of the device HangsUp and blocks the Screen, like waiting for an Operation to End.

 

I have tracked it down to the following two cases:

First Case:

E BnapiLiteCPP: ioWriteReport: Unable to VIDIOC_RAWCOMMAND: No such device

E USBScanner: Response for unexpected command. Cmd Opcode 119 Recd opcode 88

E BnapiLiteCPP: VIDIOC_QBUF Failed

E BnapiLiteCPP: ioWriteReport: Unable to VIDIOC_RAWCOMMAND: No such device

 

Second Case:

E WindowManager: [key] get btn r1 -> down, then send intent: com.motorolasolutions.button.r1.down

E WindowManager: [key] get btn r1 -> up, then send intent: com.motorolasolutions.button.r1.up

with no Action between them

 

To Compare a normal Request looks like:

E WindowManager: [key] get btn r1 -> down, then send intent: com.motorolasolutions.button.r1.down

D lights  : LED_ID_DATA_CAPTURE 1

D lights  : LED_ID_DATA_CAPTURE 1

E TimeInterpolator: Error: calling void android::TimeInterpolator::resume()() when not in PAUSED state

W TimeInterpolator: time is rewinding: -86938 Tf=1 t0=21834583862 pos0=-86938 dt=0 now=21834583862 last=0 now_last=0

D AudioSpeexSRC: AudioResamplerSpeex::reset()

D InputMethodService: Params passed to SoftKeyboard [ime_output_enabled, keystroke_action_char]

D InputMethodService: ime_output_enabled true

D InputMethodService: keystroke_action_char -1

D InputMethodService: running Injector

D InputMethodService: Injector: doInject

E WindowManager: [key] get btn r1 -> up, then send intent: com.motorolasolutions.button.r1.up

 

What could this be? Or how can we solve such a problem? Or how could it be avoided?

 

If something is not understandable or not specific enough, please ask for further details.

 

Best regards

Enrico