When i'm tallking in the phone if i need to use the speaker the pwer shutt off .
You must shure if the battery charge is complet or the battery is low and need change. I recomend to test the battery and change it. And proof again. Reset the phone disconnect the battery for to eliminate the " effect memory" and try again.
If the problem persist you must open and test the switch speacker,can be short with the power, in the Syscon circuit.
God bless you
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