I too have experienced the same problem (no auto update), but I only have the 4.1 Home version, so no push updates.

This could have coincided with the 4.1.501 update (preparation for version 4.5), although this would be hard to define. The exact date is hard to pinpoint as you don’t tend to notice not receiving something that happens automatically for a few days.

I haven’t changed any settings with my connection setting - dial-up and - always ask. I have tried to change these settings and close/reboot and change them back in the hope that they will revert to auto-update - ask.

I haven’t been overly concerned as manual updates work ok and with 4.5 just a day or so away, I will wait until then to seek a solution.