I just received my LG G4 a few weeks ago now, and already twice I've encountered this same issue of no service. It looses its service bars, and I'm not receiving phone calls. I restart it, and things come back again. It's a hassle though because I'm not always checking my phone to make sure I have service, so I end up missing phone calls.
My previous phone was older, a Samsung Galaxy II Ace X. I didn't encounter this problem at home on this phone. I could understand if it was happening while driving through mountains or something, but for it to lose service just at home seems kinda strange.
Any ways to fix this? Thanks.