ClientTCPRead() read after a ClientTCPWrite() without event callback TCP_DATAREADY doesn't answer when i open a second panel with RunUserInterface()

Hi at all and thank to anyone that will answer

here is my problem.

i have a function in a 0.025 ms timer implemented in this way

int CVICALLBACK UpdateKollmorgen(int panel, int control, int event, void *callbackData, int eventData1, int eventData2)
{
	static int timer_kollmorgen_occupato = 0;
	switch (event) {
		case EVENT_TIMER_TICK:
			if(timer_kollmorgen_occupato == 0){
				timer_kollmorgen_occupato = 1;
				gestione_kollmorgen(0);
				timer_kollmorgen_occupato = 0;
			}
			break;
	}
	return 0;
}

in this function i have a call to a modbus driver that i have write personally and it is this code, with other part that i've cutted

int gestione_kollmorgen(unsigned short int quale_kollmorgen)
{

	// gestione errore
	unsigned char ReadBuffer[2000] = {0};
	int error_number = 0;
	char error_title[40] = {0};
	char error_string[760] = {0};
	static int numero_ciclo[2] = {0};
	
	///////////////////////////////
	// eseguo un loop di letture //
	///////////////////////////////
	error_number = ricevi_kollmorgen(numero_ciclo[quale_kollmorgen], quale_kollmorgen);
	// se ho un errore salto al case di pulizia buffer
	numero_ciclo[quale_kollmorgen]++;
	if (error_number != 0){
		goto error;
	}

	if(numero_ciclo[quale_kollmorgen] >= 5){
		numero_ciclo[quale_kollmorgen] = 0;
	}

	// altrimenti esco
	return error_number;
	
error: 
	// se ho un errore converto il messaggio, faccio il log e mostro un popup
	Modbus_TLGB_TCP_ErrorTranslation(error_number, error_title, error_string);
	Modbus_TLGB_TCP_Log_Errori(file_address_log[quale_kollmorgen], error_number, error_title, error_string);
	MessagePopup(error_title, error_string);

	// eseguo una lettura per svuotare il buffer
	SetBreakOnLibraryErrors(0);
	ClientTCPRead(g_hconversation[quale_kollmorgen], ReadBuffer, 2000, 5000);
	SetBreakOnLibraryErrors(1);

	return error_number;
}	   

this function then call 

int ricevi_kollmorgen(int numero_ciclo, int quale_kollmorgen){
	int error_number = 0;
	switch (numero_ciclo){
		// se si aggiunge un case bisogna sistemare anche il ciclo for nella gestione_kollmorgen
		case 0: // leggo DRV_ACTIVE e DRV_MOTIONSTAT
			error_number = Modbus_TLGB_TCP_ReadHoldingRegister(g_hconversation[quale_kollmorgen], 220, 50, result_sint[quale_kollmorgen]);
			if (error_number == 0){
				// se va tutto bene converto i risultati
				kollmorgen[quale_kollmorgen].DRV_ACTIVE = result_sint[quale_kollmorgen][221];
				kollmorgen[quale_kollmorgen].DRV_MOTIONSTAT = convert_2_short_int_to_1_int(result_sint[quale_kollmorgen][268], result_sint[quale_kollmorgen][269]);;
			}
			break;
		case 1:
		-----------some code after--------
			break;

	}
	
	return error_number;
}

and finally my modbus driver where after creating a buffer i read the answer and decode in this way

	SetBreakOnLibraryErrors(0);
	Status = ClientTCPWrite(ConversationHandle, WriteBuffer, WriteBufferTotalLength, 5000);
	SetBreakOnLibraryErrors(1);

	if (Status < 0) {
		return Status;
	}

	//////////////////////////////////
	// fase di lettura e decodifica //
	//////////////////////////////////
	SetBreakOnLibraryErrors(0);
	while((ReadBufferToBeReadLength > 0) && (Status > 0)){
		Status = ClientTCPRead(ConversationHandle, &ReadBuffer[ReadBufferTotalLength - ReadBufferToBeReadLength], ReadBufferToBeReadLength, 5000);
		ReadBufferToBeReadLength -= Status;
	}
	SetBreakOnLibraryErrors(1);

the problem that i have is that when i am in the main page of my software, the one that include the timer, everything work correctly.

when i open a subpage that have a RunUserInterface() the ClientTCPRead() stop answering and the timer freeze and restart when i close the page.

this happen only if i open the page when the software is doing a reading and not if the cicle have finished, i try to explain better.

if i control with the flag

	static int timer_kollmorgen_occupato = 0; 

if the timer is working or not and then i open the page, if the flag is = 1 so the timer is doing a reading this will stop, if i open the page with the flag at 0 there are no problem and the timer will continue working correctly.

i have done this only to check if i have some disconnection

int CVICALLBACK Modbus_TLGB_TCP_CallBackFunction(unsigned handle, int event, int error, void *Void_Pointer_to_Flag_ConversationHandle)
{
	int *Int_Pointer_to_Flag_ConversationHandle;
	char file_address_log[260] = {0};
	char error_title[40] = {0}, error_string[760] = {0};
	switch (event) {
		case TCP_DATAREADY:
			break;
		case TCP_DISCONNECT:
			GetDir(file_address_log);
			strcat(file_address_log,"\\LOG_MODBUS.txt"); 	
			Modbus_TLGB_TCP_ErrorTranslation(-14, error_title, error_string);
			MessagePopup(error_title, error_string);
			Modbus_TLGB_TCP_Log_Errori(file_address_log, -14, error_title, error_string);
			Int_Pointer_to_Flag_ConversationHandle=(int*)Void_Pointer_to_Flag_ConversationHandle;
			*Int_Pointer_to_Flag_ConversationHandle = 0;
			break;
	}
	return 0;
}

 can somebody help me?