Not once I turned off battery optimisation for the apps I wanted to run in the background (BBC Sounds / Radio apps, a couple of fitness related apps.)
The total lack of any feedback as to what was actually killing these apps in the first place is the problem - the user experience is terrible. The phone just kills an app that worked perfectly before this release of Android, with no explanation or notification so the user can correct false assumptions. The user is left poking about in the settings until they stumble across the battery optimisation and have an "ah ha!" moment.
