Without detailed testing by affected users, apps can not guess what is going on.
Especially as other users report no problems.
Developers asked to attach the app settings .pref file via “Settings | Application | Preferences | Export”.
And provide more details, such as open map files and active map layers.
There were no answers…
Why do you think it is an app problem?
As both Android + OEM OS have been updated with newer versions.
Have you tried another charger?
Please follow the questions already asked above to do further testing.
Or you can return to the non-beta version of the app for comparison.
How many apps are active or in background in navigation (instead of closed)?
Have you used a battery monitor app to see what really consumes the battery?
Mentioned in the article:
https://play.google.com/store/apps/details?id=com.gsamlabs.bbm