Espruino Hub installed OK, but Bangle connect fails often

Ok, so I added setConnectionInterval in the code, but I do not see a major difference.

response="";
NRF.setConnectionInterval(100);

setInterval(function () {
print("connecting");
  
  
NRF.requestDevice({ filters: [{ services: ['1823'] }] }).then(function(device) {
  require("ble_http").httpRequest(device, "pur3.co.uk/hello.txt", function(d) {
    response=JSON.stringify(d);
    print(response);
  });
});
}, 10000);

Selection from output

connecting
Connected
Uncaught Error: Unhandled promise rejection: Disconnected
WARNING: Softdevice error BLE error 0x11 (BUSY) (bluetooth.c:818)
connecting
Connected
Got service
Got characteristic
Set URI
Got characteristic
Written GET
Disconnected
{"buffer":[72,101,108,108,111,32,87,111,­114,108,100,33,10],"byteOffset":0,"byteL­ength":13}
connecting
Uncaught Error: Unhandled promise rejection: No device found matching filters
connecting
Uncaught Error: Unhandled promise rejection: No device found matching filters
connecting
Connected
Got service
Got characteristic
Set URI
Got characteristic
Written GET
Disconnected
{"buffer":[72,101,108,108,111,32,87,111,­114,108,100,33,10],"byteOffset":0,"byteL­ength":13}
connecting
Connected
Got service
Got characteristic
Set URI
Got characteristic
Written GET
Disconnected
{"buffer":[72,101,108,108,111,32,87,111,­114,108,100,33,10],"byteOffset":0,"byteL­ength":13}
connecting
Connected
Uncaught Error: Unhandled promise rejection: Disconnected
WARNING: Softdevice error BLE error 0x11 (BUSY) (bluetooth.c:818)
connecting
Connected
Got service
Got characteristic
Set URI
Got characteristic
Written GET
Disconnected
{"buffer":[72,101,108,108,111,32,87,111,­114,108,100,33,10],"byteOffset":0,"byteL­ength":13}
connecting
Connected
Got service
Got characteristic
Set URI
Got characteristic
Written GET
Disconnected
{"buffer":[72,101,108,108,111,32,87,111,­114,108,100,33,10],"byteOffset":0,"byteL­ength":13}
connecting
Connected
Uncaught Error: Unhandled promise rejection: Disconnected
connecting
Connected
Uncaught Error: Unhandled promise rejection: Disconnected
connecting
Connected
Uncaught Error: Unhandled promise rejection: Disconnec

The dreaded "Unhandled promise rejection ..." is still prominently present, with a scarce "BLE busy..".