Huawei Mate 7 update Marshmallow

My Huawei Mate 7-L09 just updated to EMUI 4.0 / Android version 6.0 Marshmallow. After the official update the sim card isnt fully read. the sim is read for a second and then disappears (gives me the no sim card notification) and the it comes again adn so on. Also it read only nearly quarter of my contacts and everytime i open the call settings it closes off automatically.
is there is a solution or should i downgrade it to lollipop??
Thanks

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