When I leave my house (and wifi network), the app is continuing to do something in the background. So, it is typically drawing 25% or more of my battery life over 24 hours. Lots of 'background activity.'
This is a new issue -- within the last weeks. I have to remember to close -- not just put in the background -- the app when I leave my wifi network.
Best answer by Airgetlam
There seem to be a few threads about this issue. Most people, at least those who bothered to respond back to this forum, seem to indicate that turning off the "Lock Screen Controls" resolved the issue for them. My guess is that there's a bug somewhere in the app, and they haven't either figured it out, or looked at it.
I'd suggest that you go to Settings -> Sonos -> Lock Screen Controls and make sure it isn't green (on).
It's inconvenient, if you're accustomed to using the lock screen like I am, but then again if it doesn't kill the battery, that's a plus.
And if you'd be so kind as to come back and post here to let us know if it works for you, it might help the next person who may be in your shoes.