Try deleting the MH3U video game update and see if re-downloading its update again will clear up the disconnect problem.
And to find the individual video game updates, head to your Wii U "System Settings", "Data Management", "Move/Delete Data", and once you click on "System Memory", you should be able to find MH3U and the option to delete its "Update Data" there.
And also not sure why you may have been censored for disconnect, as I was able to post disconnect with no problems.