Why does my Lumia 630 lose 3G connection?

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Windows Central Question

my lumia 630 looses 3G connection

The 3G connection is cut out, it will be inactive (gray text) no possibilities to switch on again. The SIM will be unvisible at this time for the phone and inactive too: not possible to change to 2G connection only after doing restart.
After loosing 3G all other functions are working (WI-FI too) we I can switch off and on again the phone. After this 3G is working for a short time and allstarts from the beginning.
I'm from Hungary, sorry if I missed sg...
Thx a lot
 

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