BMW Bavarian mono digital beep problem

[desvest]

Greetings, this is my first post and is for asking for some help. I have this stereo wich testing it gives me 8 beep at certain moments.



Video:
BMW Bavarian mono digital

I thought it could be a code issue, but it would ask for it at start, wouldn't it? I have connected only one speaker if it helps for something.
Hope you could give a hand!
Thanks!