The cause of this may be that your Pi gets into a loop shouting every minute:
If you are using a headless install you probably won't notice until you look into the journal and htop and Google around or plug in earphones and listen. This belongs to the VNC server asfaik and if you boot into the VNC you have a problem even if you run headless. To switch this off is actually a requirement to get a good performance of your Pi.to install the screen reader, press control alt space
To switch it off once do the following:
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ps -eaf | grep wiz
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sudo kill -9 810
This immediately lets you get your work done in the sprint your RPi takes.
To prevent this from ever happening again uninstall it:
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sudo rm -f /etc/xdg/autostart/piwiz.desktop
The ever brilliant person who activated this should be...