@joseph zterm? :) I am no expert on networking, but from what I understand packets transfer at a larger size until they fail validation/verification, then progressively smaller packets are sent until they fail and so the process repeats. This speaks to the quality of your network traffic/flow etc. This is no answer, but maybe it helps to understand what is going on. Much like understanding the inner workings of the internal combustion engine make you feel better about being stuck on the side of the road.
:)