I am currently working on a small scanning application for the MC3200. Additionally the app is using the hardware keyboard for simple inputs into EditText.
 
Unfortunately every 10th to 15th keystroke is recognized twice although the key is just pressed once. I tried both, Xamarin and Android Studio versions of my app. The error seemed to appear more often in the Xamarin version but that could happen coincidentally.
 
The problem also appeared with the onboard E-Mail application. Maybe one of you found a solution to these double inputs with an event listener or something like that ? Otherwise I will have to send the device back in order to check if the hardware is damaged.