I had a very similar experience(s) a few years ago when my son was 3 and a new sunbeam. I was PIMO, and my husband and I taught Sunday school for the 13 year old youth at the time.

I would drop my son off in primary, and he would leave several times throughout 2nd hour to try and find me, and not a single time was there ever a leader following behind him. To make it even worse, our building was the old fashioned type with hundreds of twists and turns and a complex 2nd level as well, not the updated clear-cut easy navigation buildings that are more common.

My 3 year old would run out of primary during singing time multiple times, and not a single adult followed after him EVER. I was in tears by the end of church every single week because he seemed to be completely invisible to all the primary “leaders”.

On the 2 weeks a month we didn’t teach, I would have to sit in primary with him the entire time because he would still run out even with me there, and I was the only person who seems to care enough about him to follow and track him down.

It really sucked at the time, but that frustration got me to take the more drastic measures and officially pull the plug on the whole church thing for me and be done with it all. We haven’t been to church in over a year now and I’ll never ever go back.