Huawei p30 pro speaker defective?

I've had this problem a few times now, and for example everything went as usual this morning, but all of a sudden I hear music and all other sounds and voice messages only very quietly and distorted from the bottom of the speakers. Otherwise I managed to do it again and again with a restart but this time the terrible tone remains simple And I don't know what to do anymore. I've googled so much but just can't find anything. I ask for quick help, thank you

You should explain to what extent the restart should be able to repair a loudspeaker. What should the software have to do with the hardware?

There's probably a defect in the electronics. You won't get that yourself answered. You can't say more from a distance.

It's strange, I just posted the text, got a message and the sound is back to normal as before. I do not understand

Is a loose contact. But nothing changes that you can't fix it yourself.