i used the thermal a few hours ago and now when its quiet i can hear the calibration shutter of the flir cam clicking.
the camera is still on but the app IS NOT running
i had this a few times now, it drained the battery much quicker (sudden slope in the discharge curve)
I've noticed that I have to manually kill A LOT
of my apps because none of them seemed to go to sleep. Try going into the app section of settings, find the FLIR app, and "force close" the app. I've found that apps like Servicely
automatically force close apps when the screen is off. It's saved a crap ton of my battery while I'm not using my phone.