Honor 8 phone loses network connectivity off and on without any indication

i purchased the honor 8 in november 2017 and have had no problem with the phone till a couple of weeks ago. The phone loses connectivity on its own anywhere anytime, with no indication in the notification bar. People trying to call me will hear that the "phone is switched off". I will come to know of this problem only if i try to make a call when i will get a "no mobile network" flashing on the screen. i would have to restart my phone and then after sometime, the same problem arise. Please help!!

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