Sometimes my code moves on its own or just disappears in the Eclipse XML editor.

When I hi
I had the same issue. The following steps were the solution. Link suggest its worked for others.
Notice there are 2 bindings for each of the 3 commands
At this point you should only have 2 bindings set to perform copy/paste (i.e., ctl+c/ctl+v)
This solution was found here.