> The the root cause is always buffers? That's it? Nothing ever gets lost for some other reason, maybe some sort of collision? Indirectly; lots of collisions p

> The the root cause is always buffers? That's it? Nothing ever gets lost for some other reason, maybe some sort of collision? Indirectly; lots of collisions put stress on the buffer, so the probability that the buffer will be exhausted will increase. Of course, if an intermediary router fails after sending the message, a UDP packet will also be silently dropped.