Huawei's phone suddenly beeps without a reason?

Kh
1

I have recorded a WhatsApp memo, and in the memo my phone starts to beep for about 3 seconds

I let the voice memo run, I'm off the couch because I thought my cellphone exploded.

I had never heard that sound before. Alarm clock etc it was not that I would have indicated.

Mi

Maybe a feedback.

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