turning down volume when typing or turning my phone off

[Flatbeach]

Hi.

I have an Oneplus 3  phone, but resently when i either go to another app, turning my screen off or when i'm typing, spotify turns down the volume, and then turning it up again after som seconds. I find this really anoying, but I have no idea what to do.

Hope someone can help.

[HurlyBurly77]

The exact same thing as been happening to me over the last few days. It seems to have happened since there was an update on the phone. It's incredibly annoying and doesn't seem to just be when there's a notification but sometimes for no reason at all. It never did this before and I can't seem to find the answer anywhere.