Only time I've had problems like that a wipe off dalvk cache, a faulty install (why was magisk giving errors? What were they?) Or in some instances it was the app itself, and a older apk or wait for an update. Would resolve those kind of things.
Upgrading from 1.0.3 to 2.0 results in instant FC on a D855, had to uninstall and reinstall. Other than that, great app, does what it needs to do.
EUR region, pulled from a 3gb D855 page, thanks to the reddit g3 community for sharing the link.
Edit: it is the EUR region
xpirit Feature request: can you please make a option to remove the auto volume lowering when you plug in headphones/aux cord?