Speakers' volume fluctuates

[Kleshar]

I have purchased a Zenfone 8, 256/16 model version. 
When hearing music at high volume with the Internal stereo speakers on every kind of app (YouTube, Internal music player, VLC, etc.) the music/sound starts going up and down with no reason at random intervals: it literally fluctuates. Trying to enjoy some music is impossible. I've tried to contact support but they just asked me regular stuff. Their conclusion? " Here's your RMA module, we need to repair your smartphone " 
I find it really odd, i am pretty sure this is not a hardware-related problem. Why? Because I've switched smartphone and the previous one has the same audio-related problem. I'm coming from a 3 months old Google Pixel 5 running on android 11.
All the people i know are noticing my issue. I have also other android devices equipped with stereo speakers: these devices are on previous android versions and they all sound perfect when listening to music. 
Note: I've tried everything with zero success. Notifications' sound and bluetooth are always turned off. It's not an app-related problem : I've tried to play music from a clean factory-reset device with no google account connected and zero apps. Result? No success.
Another note: i have not tried playing music on an external bluetooth stereo speaker. I don't have that kind of item and i have no intention to purchase it at the moment.
I just want to know if you have my same problem or if you have any kind of suggestion.
I think this is just a heavy bug related to android 11 or... well, I could just be the unluckiest smartphone user in the world, buying two new smartphones with the same identical problem: it's almost like winning the lottery. 😂
Thank you.  

[shazadz]

I reported the same issue few weeks back,i have realised if you use the audio wizard equalizer and kinda make a you shape pattern it kinda solves the issue for most content using speakers

[Kleshar]

shazadz

I reported the same issue few weeks back,i have realised if you use the audio wizard equalizer and kinda make a you shape pattern it kinda solves the issue for most content using speakers

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Ouch. That's exactly what I expected: it's a critical bug of Android 11.Hope Asus will fix it very soon. Can i see your audio wizard configuration? you can attach some screenshots. Thank you in advance.

[Kleshar]

Ouch . That's exactly what I expected, it is a critical bug of Android 11. Hope Asus will fix it very soon . Can i see your audio wizard configuration ? you could attach some screenshots . Thank you in advance .

[CH_ASUS]

Can you help clarify a bit more what you are hearing?

Yes, I know your description covers a very wide range - and that's surely your case but for debugging it is much easier if we align same parameters - as we are not specifically aware of this issue happening "per default for everyone".

As to align debugging. For example;
Youtube app > play which video (link?)
You are observing the volume of speakers fluctuating. Between how much? Are you meaning small changes, but audible, or distinct changes?
Do you see the volume bar move as well, matching this change? (without physical input from you).
When referring to 'high volume' - how high is it? THe volume bar has 30 steps for example.
Is outdoor mode enabled - and does it only happen trhen in the "outdoor mode" range?
You mentioned you experienced this on another non ASUS-device. Do you mean you get this issue also on Pixel 5 with Android 11?

Thank you