Why when I updated Fb and messenger my chat heads don't stay on my screen anymore?

or:Why when I updated Fb and messenger my chat heads dont stay on my screen anymore?or:It could be that your phone is saving data when you're not ac

or:Why when I updated Fb and messenger my chat heads don't stay on my screen anymore?

or:It could be that your phone is saving data when you're not actually on messenger.

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