Have to admit, i was quite amazed when i found this topic (by accident) as its exactly the issue ive been having too.
Just had a look over my internet bandwith use and sure enough ive been going over my limits wheich has never happened previously.
I see that there is supposedly going to be a fix for this rolled out this week but I have a concern that the issue has being going on for longer than what's mentioned here.
I've had excess download charges since May and I do recall it was back in May when i first remember getting this issue yet seemingly the consensus is it's only been a problem since August? Hmmm... hope the fix actually cures the issue