Firebase Notifications, sometimes dont received nothing

Hello,
I'm working on a chat proyect, with the FireBaseNotification, and its great to work, and work excellent, i have a Beta working with some users and all work great

but i don't know, some days, the service dont work (like today), Send a messages (i see the number from message) but not recive fm_MessageArrived , i change the users SuscribeToTopic, or create new but don't work..

i don't know because i'm try the beta 4 days working excellent... all messages work to all users
-is...

Firebase Notifications, sometimes dont received nothing

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