Google Analytics Mobile : strange active users number - mobile

I'm experiencing some strange statistics with google analytics for mobile.
Day-1 active users are decreasing during the day 0.
Example : Yesterday i had 3100 DL of my app, GA shows me 5,923 active users for this day (logical since i have existing users : 20K).
BUT during the day, this number decrease to 2900 active users. WTF ?
Every day, it's the same thing, my active users are set one time and fall down after (even under my day-1 downloads)
Anyone can give me a clue ?
Thanks :)
Note : I don't edit any segment, it's always on 100% of sessions.

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Number of online users and app visits in single page application

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Today visits: 12 people.
This Year visits: 5263 people.
I don't know what the proper procedure is for implementing this.
What I'm doing as a solution is to make an endpoint at the server for computing number of online users and visits. In the client I've created a random string as UserKey and saved it into localStorage.Then I've used setInterval to send a request with UserKey payload to the endpoint every 5 minutes. This endpoint calculates the number of online users and visits based on UserKey and current date and time. Calculating Is not 100% Accurate but it's satisfactory for me.
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You can simply do it with Navigator.onLine :
Source
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See https://pusher.com/docs/channels/getting_started/javascript/?ref=docs-index
It is free but just for 50 users if you want more users you can also choose to start an own Websocket server. Which is a little more complicated (without external libraries of course).

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http://puu.sh/i2rGf/37b2dab3fb.png (its the yellow and the pink one)
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