Crashing during kite

[Lexous]

I started kiting around 8-12 mobs when I hit level 18 on my bard and didn't have a crash until two days later when I was almost level 20. So had pretty much 2 full levels and within one hour I crashed 3 times (3 out of 6 kites). Had between 13-15 mobs at the time. Nothing else had changed.