I have now experienced a problem three times during combat in the Shattered Sanctum. My game gets stuck, so I can move around endlessly yet my abilties don't work and I can't end the turn. The turn eventually passes and the problem fixes itself.
I triggered the fight via. dialogue with the Drow Minthara. Both times it started when trying to use the Sting spell as a summoned imp.

When the aforementioned fight had ended the game acted as if it was still Wyll's turn even though combat had ended. Shortly after, I entered Turn-based mode and was stuck in it