Sometimes. I've learnt through 30+ years hard experience (yeah, OK, I'm a slow learner) that each body has its injury threshold in terms of training load (in this case running distance) and mine seems to be anything over 7-8kms regularly. So I compensate by ditching the longer distances and running 5-8kms most days. With usually one rest day per week.
So 4kms do figure in my routine - usually if I have a manageable niggle or am sore from a previous workout.
A little often is better than a lot never.