I had this issue twice, but then i noticed that wow said "Applying non critical updates" when i started the launcher, i let it finish and no crash since then.. Might be the problem you have..
Do you have any Applications in the Background that could interrupt WoW and HB? Close every Background Application that you do not need and try it again!
its the only thing i run so couldnt give you a real answer. my wow is fully updated. and a background program wouldnt cause that problem with hb