SIM PIN code 1020 WP8.1 re-enter

Hello,
Ever since I've installed the latest update of WP8.1 (8.10.12397.895) Developers Preview on my Lumia 1020 the phone looses its connection with the GSM network (4G) and asks me to re-enter the SIM PIN code serveral times a day. I re-enter the code as soon as I discover this, but in the mean time the phone is not on the GSM network so I won't receive calls. As soon as the phone drops the network connection it briefly displays the Windows logo as if the phone was rebooted.
I hope this will be corrected in an next release, or beter in the final release that will come together with the Cyan update.
L8r, Henk

I think my problem is solved. My attention was drawn to an article on the user forum of my provider. Someone with an Android phone was experiencing fairly similar problems.
When my provider started with 4G a year ago they used a specialised Access Point (AP) for 4G as their default AP was not suitable for 4G at that time. During one of the many updates since, the special AP disappeared from my 1020, but since my wife’s 920 did not have the update yet I recreated the 4G AP and copied the settings from her phone. Now it seems I’d better not done that. The guy with the Android phone found out that in the meantime my provider started supporting 4G in their default AP. And that the specialised 4G AP was nog longer supported and thus should not have been used anymore. The fact that the AP disappeared during an update should have warned me.
Anyway, a couple of days ago I selected the default AP and have not had any SIM PIN code issues since. Whereas with the old 4G AP I had to re-enter the code within 2 hours at max as soon as I came at work and my phone connected to my works Wi-Fi (under control of an MDM).

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