Lumia 820 keeps asking for access point on bootup?

[silberthoughts]

I had my Lumia unlocked from EE and put onto O2 when I bought it from my neighbour last year. Really really pleased with it- just one niggle: whenever I turn it on, I get a screen asking me for the access point, with choices of O2 PAYG, O2 Pay Monthly, Tesco and giffgaff. This only happened after I updated it about a month ago. It's always got O2 PAYG, the correct choice, selected. It's quite annoying, but the phone never reboots itself or anything like that, like some others with this problem.

It's just quite irritating! Does anyone have a solution? Thanks in advance.

 

[anon(7900571)]

Download an app called "SysApp Pusher" from the store. Once it is installed, tap the 'check' button at the bottom to scan for any updates. It should indicate if any updates are found. Install any updates that it finds. Once you have installed the updates, try restarting your phone again and see if the message about choosing your network still appears.