I had an experience yesterday while sending my M100 on a DD mission where the battery levels stopped going down after it reached 73%. Watched my UAV travel another 400m without any “apparent” loss of battery power!?! Aborted mission and landed aircraft. Checked battery in GO app and it was down to 35%.
I would uninstall and reinstall the app.
Also turn the mobile device off and back on once a week or so to clear out possible conflicts.