Hi,
Try the below:
Crackling sound can be due to bad network, use a different SIM or a different phone to verify
Factory reset your phone once and try safe mode
To verify anything releated to hardware, run SMMI test
Run How to Enter SMMI_TEST (test hardware)
Go to Calculator=>type " .12345+= "
you will be entered to SMMI_TEST
If still issue persist, Kindly visit the nearest service center:
h
ttps://www.asus.com/in/support/service-center/india