E71 hangs at random "Insert SIM card" screen

Since updating to 410.21.010, my E71 occasionally shows a "Insert SIM card" message. This is rather odd, as it's not feasible to do so (the battery blocks the slot), and the SIM hasn't had any trouble before. Worse still, when this occurs the phone becomes entirely useless - not only can I not access running apps (and the model doesn't require a SIM for that), I can't even turn it off!
Upon removal of the battery to forcibly restart the phone, it starts just fine, SIM and all - so the card isn't poorly seated or anything like that. Any help would be appreciated!

First make sure sim is seated properly as you said yourself
second Try another sim card, if it works fine with that then you need to replace your sim card, Contact your operator.
and if it fails to operate properly with any other sim card too, then you need to do a Soft Reset:
(BACKUP YOUR DATA MANUALLY, Take out memory card)  Dial this code *#7370#  Enter your Lock code, Default is 12345.
And if that fails too then you need visit Nokia Care Point in your area.
http://europe.nokia.com/support/repair-and-recycle/repair/care-points
Previous Phones: 6600, 7610, 6230, 6230i, 1100, 1112, N70, N73, N95, N95 8GB, 5800XM, 5230, C5, iPhone 3GS, SE Xperia X10, N900, N8, SE Xperia Arc
Current Phones: Nokia N9, iPhone 4

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