Default WiFi turns off itself

Hi everybody, as in the subject WiFi turns off itself on my girlfriends mini 2 when she leave home. I mean she leave home to work with WiFi on but when she comes back it is always off. She says she doesn't switch it off I think she is telling true as she probably don't even know how to turn it on and off she has no apps installed that could control WiFi module, could it be system or broken module? Anyone have same issue? Thx

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