For me, it's exhaustion.
And when that happens, I rest. But if I still am not getting over it, I either tweak the plot or introduce a new character.
Something different from my original plan always got my brain back on track.
The cover's good.
And the person above me is right, the author name kinda ruined the feeling the people in the picture are supposed to portray.
You should either lower it or raise it.
Not only is it frustrating but also painful to edit a chapter for thirty minutes or more then make a big mistake (eg. Pasting the same chapter in the edited one or mistakenly clearing a paragraph) and having no way to undo it.
I have made this same mistake twice and I had to edit and edit for...