so, i recently switched to grapheneos from my old iphone, and so far i am loving it.
however, i use the sandboxed google maps for navigation, because i need it to be reliable when guiding me in unknown areas and the open source alternatives arent quite there yet. today i tried to follow a route, but the phone refuses to provide any announcements unless i keep it unlocked in my pocket (meaning after a few minutes it stops anyway). i tried all i could think of: reinstalling, restarting the phone, giving it all permissions it could possibly want, nothing. really annoying, is this a known issue? i cant really use it like this.