cortana worked in offline

Hai....I am a satisfied user of lumia 830. when updation of windows10 came,i upgraded. and recently i checked cortana. it works properly without net connection. only calling works. when i ask to call somebody, cortana calls. and i became very happy. after one week, as i did not REBOOT phone,i rebooted it. but now it dosent work. is there any possibility for previous condition?
[Mod edit: number removed]

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