[quote]it was bearable when the invasion was at the start of the instance but now it can be anytime[/quote] It could always have been "any time," though in my experience it will never pop until you progress past the first entry encounter. There's no difference to when you get invaded anyway. You're given 3 bonus revives when it happens and if he gets 3 kills it's over, or if you kill him 3 times it's over. You can only ever end up back where you started revive-wise with an invasion. That said I've had a run where I got invaded twice and the second invasion didn't trigger bonus revives. Not sure if that's supposed to happen as it's only happened a single time and I've done at least one invadable run nearly every day.