how can i avoid rewritting my comments or discussions in mylot??

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im a newbie here..and frankly it doesnt matter to me if i gain much or less in this website..whats keeping me low is that whenever i tried to participate in some of interesting topics and ive already written a very long comment or discussion, suddenly my idea vanish after i click on the start discussion tab..and then mylot would ask for my username and password again..so i need to rewrite or retype what ive written a while ago..whats wrong??can anybody there who could provide me with some tips on how to avoid this kind of situation?? its really unconvenient sometimes..thank you so much