Well it happened two days in a row, I don't think its the internet, it can't be happening two days in a row.
yesterday in one shop I pressed send Email Report manually from the menu (today I got the report automatically).
the other shop however I didn't do anything hoping it will send the email today (this shop didn't send the report).
I think the setting needs to be saved again, maybe the setting gets disturbed by something else, and it forgets it needs to send email at certain time.