Weird problem with arecord

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Hi,

I am running arecord on an Openwrt installation and I am experiencing the following weird problem: if I record a sound two consecutive times, the first time a lot of noise is recorded, and the latter the sound is without any noise. It keeps going on this way (one noisy, and the next one clear), unitl I close the terminal and open a new one: then, it keeps going again that way - but with the order "reverted", i.e. one clear, and one noisy.

Here are the commands executed:
root@55:/opt# arecord -f cd -r 16000 -c 1 /tmp/user_speech_18.wav
Recording WAVE '/tmp/user_speech_18.wav' : Signed 16 bit Little Endian, Rate 16000 Hz, Mono
^CAborted by signal Interrupt...
arecord: pcm_read:2031: read error: Interrupted system call
root@55:/opt# arecord -f cd -r 16000 -c 1 /tmp/user_speech_19.wav
Recording WAVE '/tmp/user_speech_19.wav' : Signed 16 bit Little Endian, Rate 16000 Hz, Mono
^CAborted by signal Interrupt...
arecord: pcm_read:2031: read error: Interrupted system call

Here the recorded files:
I am using the following version of arecord: arecord: version 1.0.28 by Jaroslav Kysela <perex@xxxxxxxx>

Any idea of what it is going on or any suggetion on how to figure it out?

Thank you very much!
Regards,
Piercarlo

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