Torchlight (bug?)

WHen I play as the Alchemist, as soon as I conjure up some zombies to fight for me, my mana continues to drain and it keeps automatically spawning zombies. And the audio quip "You need more mana" just repeats itself.

Anyone else get this?

Has not happened to me. Maybe try and restart a new character or shut off your 360 and reboot it. Hope this helps.