I have no had this issue yet thank god but I hope you get this fixed man. Im glad that HF is back up it's love and lyfe x3 did you find out who was causing the attack?
Adding on to what I said do you think it's recommended for us to change our password by any chance are we are risk? Because of the cross caching...
I've been having this problem because I frequently use 2-3 computers daily to log into HF. Other than that, everything runs smoothly once I clear cache/etc.