calc freezes when copying block of cells

I have found that Calc frequently freezes after I have copied a row from the spreadsheet. I have uninstalled and reinstalled all versions in both 32 and 64 bit packages. I am running Windows 10 Professional with 16GB of memory. I am using Windows Defender for anti virus.

I have tried completely reformatting my system and installing fresh Windows but still this problem of Calc freezing up persists. I love this product and in the past found it solid, but now it freezes about every 5 minutes. This is not really workable. It works fine if I run in safe mode.