As a first step, could you please ensure that you're running the current stable version of the desktop app (78.4.119)?
If you are, could you please check if you have any symlinks in your Dropbox folder? Please remember that symlinks refer to data in locations outside of the Dropbox folder, so the desktop app can get stuck attempting to access them. You can find more about this here (step 7).
Finally, ccould you also confirm for me if you have more than 300,000 files attempting to be synced to your Dropbox folder? Although this is a soft limit that depends on the hardware specifications of the computer, if you have a lot of files stored locally, they may reduce the performance of the app.
I deleted everything in my Dropbox folder and restarted the app hoping it would start downloading all my files. Instead, it started DELETING all my files in the cloud! I was able to rewind and get everything back, thank goodness.
Then, I removed the entire Dropbox directory and restarted the app. It went through the initialization process, created a new Dropbox folder, and started downloading all my files.
After a full day, all my files have been pulled down from Dropbox. Aside from the scary event of losing a bunch of files unexpectedly, it all went pretty well.
I just wanted to clarify that when you delete content in your Dropbox folder, that change is synced to your account. This means that the file(s) or folder(s) that you deleted will be removed from the website and any other connected devices.
Nonetheless, I'm glad to hear that you were able to resolve your concern in the end - awesome troubleshooting!
If you have any other questions in the future or you need help with anything else, don't hesitate to get back to us. Cheers!