LG G4 has hardware issues
A few months ago, some LG G4 owners began complaining of a bootloop issue. Unfortunately, they did not find any software workaround for this problem and Android Authority forwarded the story to LG. Fortunately, the company answered promptly and their reply brings good news to the owners of affected handsets.
According to LG Electronics' statement, the company has identified the cause of the booting issue, which is a loose contact between components. Those affected by this should contact the local carrier or a nearby LG Service Center to get their devices repaired, but only as long as they acquired their LG G4 from a carrier. On the other hand, "Customers who purchased their G4 devices from non-carrier retailers should contact an LG Service Center with the understanding that warranty conditions will differ."
The company also apologized for the inconvenience caused to some customers who received incorrect diagnoses so far. In the past, some attempts to fix the problem led to replacing the wrong parts, without solving it.