The issues are:
-When I call someone I can not hear anything unless I activate the loudspeaker. This is not always happening and seems to be temporally fixed after a reboot.
-If anyone calls me, the loudspeaker is activated automatically when I pick the call (some says this is due to Google Chrome update)
-The proximity sensor that turns off the screen while talking is misbehaving
Of course I have tried again wiping everything in the flashtool, but didn't help.
The loudspeaker activates randomly when I answer calls, but only from one specific contact. My earpiece works fine, however.
I'm on 10.4.B.0.569 Generic ES and I've found no solution to it. I just remember to deactivate the speaker phone when I answer calls from them.
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