Peterhondak you are right about the battery drain. I left mine on over night with wifi on as usual but it was dead in the morning. Never had that before. I use to go 3 days without charging.
Interesting though I still do not have SOD after having it died. Also upon restarting my vox and allowing it to sleep to see if SOD would happen I got an email yet I had not opened my email program.
I will test it over night in sleep mode and airplane mode tonight and see how it fares.