Sudden battery drain - how to tell what caused it?

My Zenwatch usually consumes <50% of its battery during a typical day. Today however it was completely dead by 7pm, even though there was nothing unusual about the day - it was worn at the same location all day, and was in close proximity to my phone all day.

Is there any way of tracing what causes this sort of sudden battery drain?

4.1.1 does not show pics and music files all of a sudden

Any suggestions... (I've eliminated any problems with FireKat and PopRocks. They are solid)
Running FireKat V20 (4.1.1.) SD card tested and is readable/writeable (128Gb). Pics are in proper DCIM\Camera folder on SD. Music is in Music\ folder on SD. (some players find music but "PlayerPro" and "Sound Picker" do not find music. Cannot change ringtone with Sound Picker or other programs (says unable to change ringtone). The pics will only show in Gallery by displaying through Picasa. These problems also occur even on stock rom before flashing custom rom. Oh, also tried "fix permissions".

I've tried everything I could think of including Odin back to beginning several times. Tried PopRocks rom, no joy. Believe my I've tested and experimented with a lot of stuff but cannot solve the problem.

Any suggestions to help correct finding my pics and music on SDCard would be appreciated.......