I'm using Lenovo P780 (new) with android 4.2.1

from time to time there are hangouts and I see the sign of "flight mod" for several minutes
and than the connection re-establishes
I have noticed it today while driving (don't recall such a situation while in a stable place)
it happened today more than 10 times and looks like I'm having a REAL problem

following an advice in another place, I tried to change settings of mobile provider from "automatic" to manual (my provider)- no good

why is it so?

do I have a bad ROM to be replaced?
is there an application that will help me to keep the connection
is there a tracing app to keep a log and point me when and where the problem happens?
other ideas?