LibreOffice 5.4 "Not Responding" repeatedly

I have a spreadsheet that repeatedly gives me a “not responding” message after moving between every 4 or 5 cells. After maybe 5 seconds, the sheet returns to normal and I can work on another 4 or 5 cells before I get the “not responding” message and the process repeats. I have tried re-setting the user profile, but that does not help. Running Windows 7

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