I'm having a similar problem, I log in and I can move around for about a 1min then one of a few things happen 1. I go back to where I spawned, try and move and get sent back again and again, 2. Anyhting I do in the server gets put back to how it was before eg. blocks come back, or doors reopen after closing them. and on top of all this the world doesn't appear outside of the castle and house and then after maybe a couple more mins it logs me out under one of I think two messages. I'll come back and add them once I have writen them down.
These are the drop msgs
Internal exception: java.net.SocketException: Software caused connection abort: recv failed
Connection Lost
Timed out