Same problem here
Had exactly the same problem
Jumped on a couple of minutes before 8am logged into my frequent flyer account. All set put in LHR-SYD for september up came the price selected went through the fare conditions, then details and then clicked on payment and then all it crashed on me tried a couple more times same thing happend
I guess they went really really quickly and three minutes is probably pretty accurate although i was all set by about two minutes past.