In Craglorn,
I was buying massive amounts of gear bags from the vendors to research traits on the PTS ( about 90 at a time ) then opening them all/selling ones I don't need. Doing this multiple times within 10mins caused the game to be completely un-responsive (could not use anything/talk to anyone/log out) so i crashed the client. When I log back in, i immediately fell through the world and was rolled back to the last location i had logged out... also received new mail every time that was sent to me "1276 months ago" lol...I was able to replicate this 3 times.
thought you should know, all i had to do was teleport to a wayshrine and it corrected itself.