Stops attacking when i am not in WoW

[Dimensionday]

When i go in my brwoser, facebook or something else than the bot can kill monsters, but sometimes it stops attacking and do nothing, and when i got in the game again i have to move 1 time and the bot starts attacking again, and that happend often...
But when i left the game in foreground that dont happens...

 

[Tony]

is your wow in windowed mode?