BCP Command Hangs Stored Procedure

I have a problem where bcp command is called and executed successfully sometimes but fails randomly.My stored procedure looks like this:

select @SQL = 'select * from [' + @RepositoryName + '] where ( IsNumeric([' + @PhoneField + ']) = ' + CONVERT(varchar(1), @FALSE) + ' OR LEN([' + @PhoneField + ']) <> ' + CONVERT(varchar(2), @ValidLength) + ')'
execute(@SQL)
set @Count = @@ROWCOUNT
if @Count > 0
EXEC sp_configure 'show advanced options', 1
RECONFIGURE
EXEC sp_configure 'xp_cmdshell', 1
RECONFIGURE

[code]....

The above procedure is called 4 times from another procedure by passing appropriate parameters. Most of the time, it executes successfully for 2 times before failing. When I try to debug, it always hangs at EXEC master..xp_cmdshell @CommandSQL. The task manager shows bcp.exe as running at this point. Interestingly, the required rows are exported using the bcp command, but the stored procedure does not move further until bcp.exe is manually stopped from the task manager.