Sitting in Counterspell mode causes fatigue - intended?

[apeppertoo]

I imagine it's because Counterspell is necessarily a combat mode, but when I'm just sitting there waiting for a spell to be cast it doesn't make a whole lot of sense for my character to become fatigued if no spells are yet being cast. I'm not sure if it's possible to distinguish counterspell from normal combat, sadly.

[EO]

It's intentional since it's an action mode. If you're not using it in combat, the best thing is to toggle it off then.