Why am I having a bonging sound on my HTC One M8?

[AC Question]

Why am I having a bonging sound on my HTC One M8

Why is my HTC One M8 making a low bonging sound every second. It,s driving me crazy.

 

[B. Diddy]

Re: Why am I having a bonging sound on my HTC One M8

Welcome to Android Central! Could it be NFC? Is there anything nearby that has an NFC chip, like a credit card?

 

[lemontang]

As B.Diddy said. It's probably NFC related. A number of users have described the same thing.
I had the same issue only after I put my S5 in a case holding my bank cards. The NFC was trying to interact with the cards chips. Turn that off and let us know how you went.