It occasionally has loud "ringing" noises for up to minutes

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Android Central Question

This started within the last months and it is regardless of whether I have turned off all applications. It also comes after a restart but then usually only for about 5 seconds.

I recently flashed the cache but that did not change the behavior.

Android version 7.1.2.
 

B. Diddy

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Welcome to Android Central! Which phone? Do you mean you wiped the cache partition? You don't flash the cache -- you flash firmware to the phone (i.e., the system software).

Does the ringing sound like the default ringtone? Does it go away if you turn off NFC?