Strangely I noticed audio coming from my phone when it was on standby on the charger! (rtsp) Would be nice to be able to mute that.
Someone is workin on this? I just had the same problem here.
The current version of Blynk is in “maintenance and bug fix only” status. All development resources are going towards supporting paying customers and on the new version of Blynk.
I doubt very much whether you’ll see this change in the current version.