Perhaps more like... 'engagement fatigue'? When it's truly rote or mindless work your brain can disengage and be somewhere else. With knowledge work you don't have that luxury, even when the work itself isn't what we could consider 'engaging', you nevertheless are obliged to be engaged mentally to carry it out. Do that long enough without deriving any satisfaction, it seems a perfectly sane reaction to want to escape the situation, or just plain shut off. It makes sense for our brains to realize we're spending a lot of brain focus and time on something that isn't activating any reward centers, and insist we stop doing that. That really seems like a fundamentally sensible and healthy response from a brain functioning properly.