Bing lock screen always late on updating

Your Bing Lock Screen will update at a certain point of the day in my experience. It will also 'fetch' new lockscreens for the next few days whenever you've got a data connection or WiFi connection.
 
Any ideas if there are any apps required to run in the background? I recently tried using the Bing lockscreen on a 920 and 730 and neither of them update. On both phones I don't allow much to run in the background, Cortana included.
 

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