Motorola Solutions — Moto G4 - Facing issues

Address:

Mumbai City, Maharashtra, 400054

I bought Moto G4 from amazon when it was launched a couple of months ago, now i am facing some frequent issues like:
while answering the phone at times i am not able to hear the person or the other side or Vice Versa.
Also, the phone gets really slow at times, it starts lagging in its performance.
my use of this phone is not very extensive as it was bought for my Mother and she is the one who is using it, hence basic functions also it shows slowness in its performance.