I'm fairly sure this is related to changes in fs.inotify.max_user_watches ("Too 
many open files"). I recently got a bunch of warnings in misc code editors 
about low values. Took me a while to understand the max_user_watches had 
reverted back to the default value of about 8000. I.e., some update probably 
changed my setting, which was much higher before, without permission. I haven't 
touched that setting for years.

This could perhaps also affect large dropbox folders.

Pro/Cons of a higher value:
https://unix.stackexchange.com/questions/13751/kernel-inotify-watch-limit-reached

Currently testing this workaround:
echo fs.inotify.max_user_watches=524288 | sudo tee -a /etc/sysctl.conf && sudo 
sysctl -p

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https://bugs.launchpad.net/bugs/1745666

Title:
  gsd-housekeeping leaks file descriptors

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