Newbi init and stops working after a while

nRF Connect v1.1: no support for Windows 10 without a dongle
so looks like I have to find an android or iThingy in the cupboard: no problem

Hi,

Yes, nRF Connect v1.1 does support connection to BLE devices on
Windows 10, but it does require a nRF51/52 DK/dongle for
communication. Built-in BLE HW will not work as nRF Connect relies on
serialized softdevice commands and not HCI.

Look at the documentation in our inforcenter.

Best Regards,

Martin

Edit:
Probably something like this https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.sdk5.v12.0.0%2Flib_serialization.html