I shoot tethered via RCCDroidPro and lately its been letting me down. Using bulb mode and leaving the camera for an 8 minute (long I know - but there was foreground) exposure the phone would reboot and I would lose the shot. I have lost two lovely image - I saw them for 2 seconds on the camera back. Anyway I finally spent some time yesterday and figured I have to stop the phone from sleeping. Today is a grey cloudy day so it was perfect for some long exposure work.