FTP is so insecure now, I just disable all FTP access and use SSH / winSCP for file transfers now..
Ideas of why it stopped working, could only be down to your host, some configuration change or something.
Life is a tool, use it wisely and properly. Don't break it, because you can't exchange it if you do.
Life is an instrument, it needs regular cleaning, maintenance and tuning to keep it at its best.
Fear, is not knowing. Terror, is finding out.