Support huawei 8800u pro - emergency calls only lock-up

Sorry bu this group is the closest i could find to my question!
My huawei ideos x5 u8800, at least once a week and usualy at night, (without me using it at the time) goes into emergency calls only mode and locks up. only way to unlock it is to turn off & on again. my phone is not rooted
any ideas?
thank you

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