Hi geraldpasion,
Currently your site is not available with 500 - Internal server error.
Unstable work of the server can be possible cause of your issue. You can try to check log files on you server, perhaps you find some usseful info for us there.
Regarding to notifications, it also can be related to described above and you also can find more info here.
Please let us know if you have additional info about your issue.