Playing on a server with 1.10.2 and another with 1.11, after a while of playing, I experience a disconnect related to invalid packets. Whether it be and invalid header, or improper packet size, these things occur quite frequently after the first. There doesn't seem to be a specific trigger, only that I'll be doing something and dirtscreen with the disconnect error.
Only noticed this being a problem with forge installed. The 1.11 server i play on is vanilla but I forge installed for clientside mods like Journeymap and JEI.