Issue: problem with editing posts and VMs

I don't know if it is just me, but since a few days I hav problems everytime I edit posts or VM's.

when I want to type the first time within the editor box, the cursor jumps back to the top of the post.
that's annoying, but not the main issue.
when I want to save the edited post/VM all breaks did disappear!
Reall always!

Then I have to edit it again, I have found out, that I can avoid the disappearance of the breaks, when I "preview" the post.
But when I for example do this as the first thing, in the preview also the breaks disappear...

it is really annoying and I am afraid to update my cards/thanks/wishes post, since it is very long...

is it only me or has someone the same problem?

As I said: it's since less than a week