I've logged in daily for over a year and a half now.
Each and every 28-day event has shown up on time with no error or delay.
Each and every daily reward has been awarded on time with no error or delay.
So, the answer to your question... along with countless other's in multiple other threads...
No.. no.. and.. no!
Just in case anyone else missed my answer to, "Is Gree punishing the most loyal players and rewarding people who don't log in everyday?" ...the answer is NO.
Thanks for letting me have an opportunity to beat the dead horse.