I have recently had an issue while using Esri Maps for Office.
Issue: Once I have selected the rows to be geocoded, and executed the process, it starts an endless cycle of reprocessing the rows until interrupted.
Reason: A spreadsheet column(s), which contain numeric values, are formatted incorrectly. In Microsoft Excel these columns will usually have the green triangle with the Trace Error button appearing when the cell is selected.
Resolution: Convert all numeric columns to number format in the spreadsheet. For example using Microsoft Excel. Click the dropdown icon next to the Trace Error button and select ???covert to number??? or alternatively select all cells, right click selecting Format Cells and under the number tab chose Number.