SORTA NEWBIE QUESTION

Hey all...I have been using Smart FTP for about a year or so....I usually do download using the direct way....My question is i guess 2 fold....what is the easiest way to download shows....what is the difference between Queue Source, Global Source...the benefits....2nd QUESTION....I am noticing that while I am in the middle of downloading something it will disconnect me or give me the error 421....what am i doing wrong.....PLEASE HELP