This has happened to me twice, both times I have been far North, the one thing that is the consistent when the reset would happen, I would be hiding in a tree.
Not by any tree, but by a pine tree. I would be in by the trunk so that I would not be spotted upon logging in. However, when I logged in I was at the coast with nothing.
This has happened on two different servers. The first I was logged off for about 8 hours, the second was maybe 5 seconds.