Trouble uploading files

I’m trying to upload an updated theme for a Wordpress website (something I’ve done many times before.) It’s taking about twenty minutes to upload the first six files and then fails on the remaining 1800 files. Usually, the entire process takes me about 3-5 minutes.

I’ve tried different FTP software, booting, testing my upload speed via speakeasy. Everything else is running fine.

What am I doing wrong?

My server is araucaria.