Avoid timeouts with FileZilla
FileZilla has a setting called "Timeout" that is triggered if no data is sent or received during an operation for longer than the timeout (default 20 seconds). When the timeout is reached the connection will be dropped and FileZilla will try to connect again prompting you for a password. This may interfer with long runnings transfer.
To increase (or disable) the timeout:
1. Start FileZilla.
2. Click 'Edit' in the menu bar.
3. Select 'Settings' in the drop-down list.
4. Increase the timeout setting to your liking or put 0 to never timeout. The settings section is marked in the image below.