Errors: Microsoft Excel has stopped working - crash in pivot table

Hello,

I have created several reports containing pivot charts with slicers, pivot tables and data sets. Total file size is around 5MB. Need to do an update in my pivot table Like adding an additional grouping on one of my dimensions. As soon as I start doing so the Microsoft Excel stopped working error message pops up and my file crashes! Removing existing groupings seems for some reason to be impossible as well: nothing happens when I do this. Anybody facing similar issues and how to solve this without having to rebuild all my reports?
Hope you can help me.

I know this is old, but did you find a solution?