The Ringo stopped finding the sim card

For no apparent reason, it just stopped finding it. I made a few calls, got a few sms, so i guess the sim card is ok.

Any ideas?

Ive tried removing and reentering the card, reseting the phone, but it still acts as if there is no sim card at all.

Sim 800c pcie adapter, 15.5.2019 v1.0.

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Thank you