How can I use Put in Dreamweaver consistently?

What is going wrong for me in dreamweaver? Sometimes I can Put my files successfully to the servers, and other times it gives me an error message. I close out of Dreamweaver, reload, Put and it often then works. My friend suggests that the Put function in DW is ‘broken’ and says to use another FTP program. I’d like to stick with DW if possible. Do other users have this problem? Is it me or is it DW or my server or…?