That’s very strange considering that it is present on both my 10 III and XA2. And it doesn’t take any effort to trigger it - as videos posted in the error report show, a simple change between two ambiences having different sounds is enough for sounds from one ambience to overwrite the other one. I had to stop using ambiences because of that.
It would be really interesting to know what may be causing that it so badly affects both phones of mine but not others… Do you have different sounds in those two ambiences set for calls, SMS or email and are you sure that after switching between them the sound settings of the second ambience don’t get replaced by sounds from the first one as shown in these videos? Stunning.