Why is my Samsung S6 losing mobile network connection?

[s6droid]

why my samsung s6 loses mobile network connection

I have mobile connection to my network buy suddenly it goes away and says no network. Why does that happen
i have searched the internet factory reset it everything.
somebody maybe with this problem could help me please.

I am dutch my phone is free of lock

Thankbyou verymuxh

 

[Knutti]

Hi, did you find a solution to this? I have the same problem; I got a brand new S6 four days ago, I insert the sim card and get mobile phone connection (including data) for 5-10 minutes - before it drops out and all it says is "no network".

Also the "mobile networks" icon in settings disappeare after three signal is lost.
I'm in Norway, but it's not a operator problem as the same sim card is working on a IPhone 5.

Do you have the same problem?

Thanks anyone for help.