Falcon SDK 5.7.261 ，Replacement device communication fails

Hi Expert, I am using the Falcon SDK to develop a communication application. When clicking "Start" in the app, the communication begins. I observed the following behavior:

1. After connecting a KNX device（15.15.255）, clicking "Start" triggers new Bus(selectedConnector), sut.OpenDevice(address), and WritePropertyExt — these succeed.
2. When I replace the KNX device with a new one (address 15.15.255) and click "Start" again (still executing new Bus, sut.OpenDevice, and WritePropertyExt), it fails. However, if I click "Start" a second time, it succeeds.

Why does this happen? What adjustments are needed in the program?

if (!KNX_GetUsbInterfaceState())
            {
                if (!KNX_ConnectUsbInterface())
                {
                    _strReturn = "KNX USB acquisition failed!";
                    return _strReturn;
                }                
            }
            //try - catch - finally ,using是必须的
            try
            {
                using (Bus sut = new Bus(selectedConnector))
                {
                    using (Device device = sut.OpenDevice(address))
                    {
                        device.WritePropertyExt(objectType, instance, propertyId, propertyDataType, index, numberOfElements, data,true,HandleProgressUpdate);
                    }
                }
            }
            catch (Exception e)
            {
                _strReturn = e.Message;
            }
            finally
            {

            }

error:
No T_Ack received for telegram: PropertyExtValueWriteTelegram APciPropertyExtValueWriteCon_req -> 15.15.255 -  (S=1) ObjectType=65431 Instance=1 PropertyId=200 NumberOfElements=1 StartIndex=1 Data=$55, $aa, $00, $64, $00, $00