What is this annoying "clink clink" sound?

It sounds like a ringtone, notification tone or alarm tone. Play them all until you find it.
 
I know this is a bit late to the party, but for the life of me I can't figure it out. Everything I've found online does not help. Did you ever get a fix? Thanks
 
Do you have NFC turned on? Is your phone making contact with something that has a magnetic strip like a credit card or your driver's license?
 

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