Is it happening on your Samsung tablet, iFly 740, or the Windows machine? If it's just on the Samsung, it might be one of their "helpful" features like Smart Network Switch or the power saving settings, and not the Stratux at all. Otherwise, it's probably on the Stratux side and the card failing or filling up is 99% of the problems on those.
The iFly units can be run in the background so you can get to Settings and check things without shutting down. Menu -> Exit Application -> Run in Background.