Lost thousands seven hundreds something steps

[Manomouj]

I am in a walking challenge had about 21 thousands mile and decided to bump it before going to sleep. Run in running machine and watching my steps on the phone while its getting close to 12 pm. I had 23k 778 steps in turning 12 and suddenly bumped down to 15k 139. Very disappointed. Anyone had similar experience? Does anyone know how to fix this? 

[Julia_G]

Hi, @Manomouj , your steps aren’t deleted, they just reset to zero for the day at midnight.  I am guessing you were looking at your 7 day count.  This is a rolling count so every day at midnight the steps from 7 days ago drop off the count, ready for the new day.  You didn’t lose any steps!

[Manomouj]

No, it was my daily and is now lost. Realizing Fitbit is not as reliable after talking with customer service she said I need to make sure to sync before 12 or I will lose steps. Literally disappointed in this level of unreliability.