WinSCP Easy to Lost Connection

Why my WinSCP easy to lost it connection, so if I already edit a file and want to upload it, I must to reconnect again because my WinSCP is too easy lost connection.

Anybody here who have same problem with me? can someone tell me how to solve this?

Thank all.

Try to enable keepalives:
https://winscp.net/eng/docs/ui_login_connection