HoboMobile app "Internal Communication error (code 1002)

Hello, our Hobomobile app doesn't connect to our hobo temperature Datalogger MX1101. We tried several smartphones with the hobomobile app - everytime our datalogger will be displayed inside the "In Range"-field, but after tapping on it to connect, it says "Connection Error: Internal Comunication Error. (code 1002). Cancel / Try again. I don't find anything about this error in hobomobiles user guide nor searching via google & co... Battery's ok, device is logging, it's signal strength is ok also... so what's the error trying to tell us? Since the device worked perfectly for the last 15 months...
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