I have noticed this a thousand time and then I have decided to use copy my comments after I draft it if I suspect that it's lagging.
Unlike Gmail that uses Internet access for its "Drive" except you opt for offline sync, Bitcointalk forum doesn't function that way.
I can't say for sure if it will be visited but for now, you'd have to save your drafts by copying and pasting after a refresh.
Draft aren't much useful in Bitcointalk. At least I didn't think it was that useful. As far as I know, unless you click the preview button the draft function won't save your texts. That's the problem. Even after having the draft feature, if you didn't clicked previous, all is lost.
So it's better to use either, a note app or online notepad websites.