Custom Sorting with multiple visuals on the page causes an error

I've implemented custom sorting in a custom Power BI visual I've created.

It all works fine when there is one visual only on the page.  However, if I have more than one visual on the page, I get an unexpected interaction between the two visuals that causes a continual update.

You can see what I mean in this video link: https://cloudscopeio.blob.core.windows.net/public/DataSorting.mp4 

In my visual, I let the report designer assign 1 or 2 columns that they want to use for sorting, and the direction for each column.  In the update method, I retrieve these values/options and then apply host.applyCustomSort. 

It's all pretty straightforward, and as I said it works fine when there is only one visual on the page.  There is no issue doing sorting when there is two visuals on the page when using the normal sort feature.

I haven't seen a lot of posts on this topic.  Does anyone have any guidance?

private applySorting(): void {
    if (this.enableLogging) {
      console.log(`[${this.host.instanceId}] applySortingExecuted`);
    }
    const sortColumns = this.getSortColumns();  //gets a an array of column IDs
    const args: CustomVisualApplyCustomSortArgs = {
      sortDescriptors: [],
    };
    if (sortColumns.length === 0) {
      return;
    }
    for (let i = 0; i < sortColumns.length; i++) {
      const sortColumn = sortColumns[i];  // The zero-based column ID to use from the table
      const queryName = this.dataView.table.columns[sortColumn].queryName;
      const val: string =
        i === 0
          ? this.settings.generalOptions.sortDirectionA.value.toString()
          : this.settings.generalOptions.sortDirectionB.value.toString();

      if (this.enableLogging) {
        console.log(`[${this.host.instanceId}] ${queryName}: ${val}`);
      }

      const sortDirection =
        val === 'asc'
          ? powerbi.SortDirection.Ascending
          : powerbi.SortDirection.Descending;

      args.sortDescriptors.push({
        queryName: queryName,
        sortDirection: sortDirection,
      });
    }
    this.host.applyCustomSort(args);
  }