Prezi is autosaving for three hours

I was working on my prezi for three hours with google chrome, but did not recognize that it stucked on “autosaving”. i have no problems reaching my prezi via the normal site, but the things i did the last hours are not displayed when im getting to the prezi. in the edit mode, its still showing “autosaving…” .when i copy the link from the edit mode, its showing "504 gateway timeout- server didnt respond in time in any browser. any help is appreciated, i need the prezi for my final exams.

actuallly, its not possible to enter either now