after every 24 hours Firebase stopped working and when i update pods it again starts working

I am working on Firebase and i have one query. I have login trough firebase and fired insert, update, delete queries.

Here is my code:

[self.data observeEventType:FIRDataEventTypeChildAdded withBlock:^(FIRDataSnapshot * _Nonnull snapshot) {
        NSArray *array = snapshot.value;
        NSLog(@"%@",array);
    }];

This block working perfectly but after every 24 hours it stops calling but if i update pod then again it starts working. please someone help me with this.