Why does my phone change to silent mode by itself?

[Sir Wanda]

I have an Oppo Reno4 5G it turns itself to silent mode. Has anyone had the same problem? and if so is there a fix? Thanks

 

[Kizzy Catwoman]

Hello there. What phone do you have? Is this happening regularly or just occasionally? Does this happen in safe mode as well?

 

[tube517]

Do you have a Do Not Disturb Mode set for your phone?