addCustomFilter is lost when grid view is refreshed

function Form_OnLoad()
...
preFilterLookup();
..
}

function preFilterLookup() {
    Xrm.Page.getControl("a_team").addPreSearch(function () {
        addLookupFilter();
    });
}

function addLookupFilter() {
    var fetchXml = ".....";
    Xrm.Page.getControl("a_team").addCustomFilter(fetchXml);    
}