Why do my spells suddenly start autocasting?

[auraneas]

And how do I stop them?

[Triu]

Apprentices.

[auraneas]

Oh, no--I don't mean the one I've got my apprentice casting. I keep suddenly finding that a particular spell has suddenly decided to cast itself over and over, without my telling it to.

[Maticolotto]

That seems pretty odd. If you close and reopen the game, does it continue to cast?