Espruino Hub installed OK, but Bangle connect fails often

Hi,

I installed Espruino Hub on my RPi, and loaded the example code (added a setInterval) from https://www.espruino.com/BLE+HTTP+Proxy on my Bangle.

response="";

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);

Sometimes the Bangle gets the expected response from the Hub, sometimes I get error Uncaught Error: Unhandled promise rejection: Disconnected.

 ____                 _
|  __|___ ___ ___ _ _|_|___ ___
|  __|_ -| . |  _| | | |   | . |
|____|___|  _|_| |___|_|_|_|___|
         |_| espruino.com
 2v06 (c) 2019 G.Williams
>
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
Uncaught Error: Unhandled promise rejection: Disconnected
connecting
Connected
Uncaught Error: Unhandled promise rejection: Disconnected
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
Got service
WARNING: Softdevice error BLE error 0x11 (BUSY) (bluetooth.c:818)
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)

I got similar errors when I used my own code in the Bangle and a self-coded BLE server on my Esp32 (ref http://forum.espruino.com/conversations/349804/#comment15369436);

Could this be caused be an "issue" in the BLE handling of Espruino, or is it unreliability in the BLE protocol?