Since 17.301 - poor battery performance, caused by SIM always on?
Initially I thought it was just a coincidence, and that the battery's worn out having been used daily since I bought the device at launch. However something else I've noticed is that the traffic connection has a link established pretty much immediately after waking up from sleep (again, this is since the update). Normally I'd expect a minute or so for the SIM to establish its connection.
Is it possible that the device is no longer shutting down the data connection when it goes to sleep, and in doing so draining the battery?