This link describes my problem nothing changed on my end but the last few months i noticed i will wake up ipad dead just from being in its usual attached to the keyboard position and I’ve NEVER had battery issues as long as i owned the device. I don’t use the apple pencil and for now I’ve disabled BT until I can get to the root of the issues. Honestly i suspect its a bug with iOS as no background apps or apps in general are using the battery per reviewing settings. Honestly i haven’t used my ipad much and when i go to pick it up its dead - what a turn off
Please let me know if anyone else has experienced this??