If you're having issues with a workbook on SharePoint, try ellimiating elements of the workbook using the half-split technique.
- Delete half the worksheets in the workbook, upload and test.
- If the workbook still exhibits the same issue, delete half the remaining worksheets in the workbook, upload and test.
- Continue with this method until the offending worksheet(s) are identified.
Once the problematic worksheet(s) are identified, try deleting elements from the sheet until you find the problem.