Could I have a network or phone problem?

[Orlioto]

Network or phone problem

Hi everybody,

I have a problem with my new z5 compact and would love to have some advice or ideas.
I checked my power management options and the details on the battery usage show some blank intervals, that I don't have explanation for. Also i noticed it looks related to the network service. During these intervals I have had service and used the phone normally, so it looks strange to me.
I'm also experiencing some random restarts of the device.
Anybody having the same problems? Any ideas?
Attaching a screenshot of the battery usage:

Thank you!