Problems when changing font in multiple page spreadsheet

Since I have upgraded to LO4.1 when I change the global font in multiple spreadsheets in LOCalc it starts to behave in a strange manner. Such as auto saving a few times before letting me change font.

It works OK when I do it on a single page but when I select multiple pages I get the problem.

I appreciate any advice.

Many Thanks for any help.
David

Sorry DRB what do you mean with global font?
Please can you detail step by step what do you do to get in trouble?

Edited.

Hi DBR, in this way you are formatting all cells with a direct format.
Editing the default style can do the job or create your proper style and apply it.
Please take a look to calc documentation:
LibreOffice_Calc_Guide
specially the chapter 4 - Using Styles and Templates.
Invest a few time in it and you can see the benefits using them.

Thanks for your response.

I have multiple pages which have the same font.
I select all the pages
Then I select all
When I click the Font drop down box the spreadsheet seems to autosave and take time to allow me to change font.

Thanks again
David