Editing grid dropdown only works once - then "No Records Found"

I'm periodically refreshing a grid using an angular service's subscribe method.  I realize there are other ways but I need to be able to edit the grid so I'm trying to control the refresh by suspending the refresh timer during the edit activity (only 1 column is editable and it's a dropdown).  I struggled with showing the dropdown of options from a static list, but finally got it to work.  However, after the first edit my dropdown no longer works it says "No Records Found".  Any idea why?  Is there a better way to do this?

I don't see documentation about why the dropdown only works 1 time (or maybe until the grid is refreshed).  Can you point out what is required to make it work > 1 time?

this.priorityParam = {              params: {                  allowFiltering: true,                  dataSource:this.priorityChoices,                 query: new Query(),                  actionComplete: () => false              }          };

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ngOnInit(): void {      this.data = orderDatas;      this.editSettings = { allowEditing: true, allowAdding: true, allowDeleting: true };      this.toolbar = ['Add', 'Edit', 'Delete', 'Update', 'Cancel'];      this.countryParams = {          params: {             allowFiltering: true,              dataSource: new DataManager(this.country),              fields: { text: 'countryName', value: 'countryName' },              query: new Query(),              actionBegin: onbegin,              actionComplete: () => false               }      };  }    }  function onbegin(args){  args.query.queries = []; // modify the query  }