Execution of setTimeout with replaceWith

I have the following code that executes a query in DB with ajax. So when in success I add append instead of replaceWith, the function works perfectly and runs every 5 seconds, but when I insert replaceWith instead of append, the function only executes once and does not execute setimeout. >

PS: php variables appear so because the function is inside a php query.

function fetchdata". $row2['id'] ."(){
    var dz='". $row2['id'] ."';     
    var dld='$jmmj';

 $.ajax({
 type: 'POST',
    data: {dz: dz},
  url: 'submit4.php',


  success: function(datas){
    if(datas!==''){
   $('#message18w". $row2['id'] ."').replaceWith(datas);


     }else{ $('#message18w". $row2['id'] ."').replaceWith('');}
     setTimeout(fetchdata". $row2['id'] .",5000);
  },
    error:function(datas){
   setTimeout(fetchdata". $row2['id'] .",5000);
  },
  complete:function(datas){
   setTimeout(fetchdata". $row2['id'] .",5000);
  }
 });
}

$(document).ready(function(){
 setTimeout(fetchdata". $row2['id'] .",5000);
});