From the blog "Tools and Technology"

Many Residents have noted that in the last few weeks we have had an increase in disconnects during a teleport. These occur when an avatar attempts to teleport to a new Region (or cross a Region boundary, which is handled similarly internally) and the teleport or Region crossing takes longer than usual.  Instead of arriving at the expected destination, the viewer disconnects with a message like: Darn. You have been logged out of Second Life. You have been disconnected from the region y