missing worker2manager and manager2worker events

I have noticed that sometimes (more often than not), not all workers see a manager2worker event or likewise not all workers report a worker2manager event on manager - missing as high as 10% of the events and as little as 1% of such events are 'missing' ie don't show up.

This is puzzling since I am not sure why/where bottleneck is or what might cause the disappreance.

Is there a way to assure that these events are movig data as expected ?