A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
I am having the same problem since getting Office 2013. I happens rather a lot. I have never had it jump to a cell or another sheet in the same workbook though; always to other workbooks.
The cell freezes and I have been transported to another workbook. It is important for me to work with multiple workbooks open. I never had this problem with any earlier version of Excel.
I believe the cause is inherent in the way workbooks are now 'kept separate' from each other.
I have noticed that it jumps to the last active cell used in that particular workbook.
I have also noticed that this happens an awful lot when the auto save function finishes saving all my open workbooks.
In the past I turned off the auto save function as I had a habit of saving my work regularly. I have not done that yet with 2013. Maybe that will fix the problem.