I just got the HD... and I noticed in the power saver options there is a box that turns off wifi when power saver turns on, as well it disables all other heavy battery users... it happened to me and I went through everything and found it... don't know if you figured out the problem but you might want to look at that.
Settings -> Power Saver and it's in the power saver settings or you could just disable power saver.
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