Dear friend same here poor sound output , bad camera quality and UI is slow after completing on one year, performances decrease this happened with moto g2 also then I purchased moto g3, may be Motorola forces us to upgrade by downgrading existing phones automatically, may be they run some software which make phone performance decreases. I have to sell this my best phone to buy Samsung Galaxy on8. Samsung improve their quality day by day as we use unlike moto.
I will not auggst to any 1 to buy this fon, thia is only my opnion
