I have had my LG G4 for over a year. In the past 6 months I noticed that I lose network connection constantly. Mostly the phone shows 4G LTE with 2-3 bars but I'm unable to connect to the internet. Other times the signal switched from 4G to 1G while stationary. I've seen other post indicating the same issue. The fix was to change the Mobile Network from Global to LTE/CDMA. This didn't work for me.