Knocking noise under vehicle

:
cx5 gt 2016
Hi guys
I think it might be my first post on this forum.

Had my mazda cx5-gt 2016 awd for over a year and 23000km, happy with it but recently discovered noise that was not there there before.

It appears when you are driving let's say 40km/h, let of gas which causes rev to drop down to 1000rpm, and when you gently step on gas knock/click can be heard coming from underneath of vehicle. My wife described it as 2 wood planks taping each other.
Would that be anything to do with AWD system? Transmission?

Also other minor issues that we will be addressing with dealership are :
-Dor locks making noise
-hazing on inside of headlamps
- shaky drivers mirror - still no fix
 

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