I know there has been a lot of writing regarding BT dongles and that you shall avoid using USB3 ports due to interference. Use a USB2 port instead, preferably not close to a USB3 port. It is also highly recommended to use a USB extension cord to be able to put the dongle closer to the device and away from USB3 connected devices. I had to do this with my old Launch to get a stable connection.
I got a Handy now so I cannot tell if there is a recommended dongle for Keon. I bought an ASUS USB-BT400 Bluetooth 4.0 USB-Adapter, which worked well with my Launch, but that was 2+ years ago and I don’t think that particular model is available anymore. It is probably replaced by ASUS USB-BT500 Bluetooth 5.0 USB-Adapter.
Found an old web browser bookmark about BT and USB3.
https://www.bluetoothandusb3.com/the-explanation