I have been thinking about the experience that you talk about, how interesting!
I have no answers but some questions, if I may: are these “scenes” always the same, these children playing? Are they familiar, do you think they could be memories? How do you feel when you experience them, is there a particular emotion associated to them? Do you enjoy them or do they disturb you?
The only thing that comes to my mind is maybe you should not think too much of them, not expect them, not look for them, not wait for them to arise, nor worry if they do… the mind is such a mystery ( to me…), some part of it could even be create distracting images – just when you are actually trying to concentrate on some other thing…
These here are just thoughts, so please take with a pinch ( or a bucket) of salt.
All the best to you and to all!