Dropbox v53.4.67.
The app is using 40-80% CPU constantly on 2 different Macs. There are NO files currently being synced on either machine. The Dropbox menu item reports nothing is currently happening (no syncing, no indexing, "Up to date" is displayed).
I've tried quitting and re-opening the app on both machines.
I've tried restarting both machines.
Both machines are running 10.13.6.
Both machines were running older versions (took advantage of restarting to update both). One was on 10.13.5, other was on 10.13.3. Both were experiencing the problem before and after the updates.