FTP stops working after first successful upload

I've been trying to upload 3 files using FTP (iNet 1.2) and no matter what, it only uploads the first file and not the other two. This code works fine in my Android app. If I comment out the FTP code for the first file, the second file uploads but not the third, and so on. Here's the code for uploading the first file:

If File.Exists(filepath, filename) Then
ftp_dest = "/public_html/uploads/" & filename
FTP.UploadFile(filepath, filename, False, ftp_dest)...

FTP stops working after first successful upload

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