I think you could try to deactivate the "stress doesn't go up" mod after putting your staff to vacation, then reactivate it after your staff have returned from vacation.Some people got too much stress level and got burnt out. And even if I put them in vacation, the stress level still wont go down. The mod "stress doesn't go up" is activated so that may be part of the problem. Is there any way to add a "reduce stress" sort of thing?