random notification sounfs

[Randy McClellan1]

This has happened on my Galaxy 8s and not until Monday on my oneplus 5t. Every so often (once or twice a day) my phone will go through dozens of notification/browser refresh sounds. The time is not consistent, neither are the order of the sounds. It happened under Nougat as well and this week is the first time in Oreo so I do not think it's OS dependent. Anyone have any advice?

Thanks

 

[B. Diddy]

Are the sounds definitely the default notification tone, or could it be a completely different tone? I'm wondering if it could be due to NFC -- see if it still happens if you turn NFC off.