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Well since another computer didn't help, nor another ISP (public wifi), it sounds like it's an issue on the server's end.
If you have access, check the server's logs too. Server-side FTP server logs, fail2ban logs if it's installed, server-side firewall logs, etc. And check the server's load / processes too.
Could be a network issue too of course.
As the others suggested above, I'd try SCP and SSL FTP too (ftp clients have this in the connection options, but the server needs to support it too).
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