Ibot problem (attacking)

When my char goes to spot it buffs normally and starts attack.. it kills few monsters and then it just stops attacking them?? My two chars has this problem but one does not.. anyone have this same problem or knows way to fix this??:(

I have this problem when my chars are on clientless (expect one).

I am also having this same problem with one character, and not the other... he attacks normally for a while, then just stands there, with next mob targeted, but no attack... any help would be appreciated...