I also face same problem of resetting the setting , however I am already running the latest app 1.0.9 on iOS, I think it's a firmware issue as well. But I have off the camera before it still not preventing it to reset the setting to parking mode to OFF!
Make the adjustment, then tap the ‘back’ arrow to produce the “setup changes have been saved” message. Then hold down the power button on the camera for 2 seconds and release. Close the app and restart. When you reconnect the settings will have been saved.
THINKWARE released a new version of the app late yesterday (8/11/17) which on first test appears to have fixed the problem, so try that if you haven’t already.