Intermittent brief audio dropouts

Detailed info fetched. What is causing CPU overload at every minute for 3 seconds long?
Using Fpbx Distro 10.13.66-19 with asterisk 13.

We used “top -d 0.1” command to look what is happening every whole minute, and recorded the screen for analyse.
When the audio drops at every whole minute, the top command shows us several command which overloads all the cpu cores.

I will attach 3 screenshots, with 3 secons of top command.

What is causing the overload in cpu?
user ‘asterisk’ with command ‘asterisk’
user ‘asterisk’ with several commands ‘php’

This lasts for 2 or 3 seconds, afterwards, al the audio is good again for at least 55seconds.

The screenshots will show it all.
can I disable this asterisk user php commands to test it?