I too am having this exact issue. I'm currently testing to see if a complete uninstall and reinstall helps. Will report back. My insync version is 18.104.22.168131, running on a 64bit system.
Also, Windows 10 is completely up-to-date. The antivirus software packages I am runnning are ESET Nod32 and Malwarebytes 3.0 Premium.
EDIT: The reinstall did not work