The first 2 times i went in (hard mode), NO balls that spawned on the 2nd boss. NONE. Guildies took others in and got pwnd by the expanding lightenign balls. i ran it with them next day, no balls (i was dps). So i went to tank it tonight (primary spec), and its been a LONG time since ive blown thru all of my defensive cooldowns in the first minute.
Guildies told me that on one run, the boss dropped balls every 5 seconds, the whole room was full in 30.
So, they need to take a long hard look that this buggy boss.