I can confirm this and agree with thestand. I also think it's when monsters are just on the edge of being out of range.
Also it's not that you "regain" aggro as some stated above. You always have the aggro. They run towards you and never stop or turn even if you succeed provoking them. I paged...
To unclutter my house I am selling the following items. Reply or PM offers
3x a crystal ball of reputation
2x Bag of halloween candy (36 items)
a ogre lord statuette
a gargoyle statuette
2x a lich statuette (grey)
a lich statuette (red)
a evil mage boss satuette
a dragon statuette