As shown i have a Msi laptop, its been a few years that i have it, quite a few. One day, around a year ago, i turned it on...

The speaker has been working fine for almost 2 years, then after an incident where i used a mosquito repelent sound...

So if i understand it correctly your fan/fans are going to the dump. From my limited personal experience, ive encountered a problem where my fan would start making weird noises, at first it was like scratching, then got louder after a few months to a point where it would work like a tractor. Loud noises, like something was touching that was not suppose to. After i oponed the laptop, removed the heatsink, i noticed that the casing of the fan was scratched. This led me to believe the blades are somehow moving around, i googled found out that after a bit of time the fans wear up and become “wobbly”, they move around and probably touch the casing of the heatsink on top, or the casing of the fan itself. If that is the case for you, replacing the fans would be the best option. I dont recommend the path i took of bending the metal that connects to the heatsink and is around the fan so the blades even if wobbly wouldnt touch it. But i think that might mess up the heat exchange.

Update on the situation, so my problem got resolved, not really sure how, but the speaker has stopped cutting out. After i took it apart, removed the battery and tried to play it through the cord to see if anything changes ( It did not) i left the battery out for a while, then one day i put it back in and its working again without cutting out the sound even at maximum volume. Not sure what was up with it or if me removing the battery then putting it back in fixed it, but hey its working and i will take it.

Yes it is, i just removed my own battery, the unit is working fine