Temporarily forced to use a 520 - extremely frustrating in general, but the thing is also consuming data at an alarming rate. The usual things - backgound tasks, phone software updates etc - have been disabled, stopped and plugged. I do however play around quite often with HERE Maps - over which I seem not to have any download control. Does it download additional maps automatically and uncontrollable when I scroll to new geographical areas? Could that be the cannibal? If so, how do I control it? Or is there another fox amongst the chickens?