There are often compatibility issues when using wireless setups with displays. LG is one of my favorite brands to bash for their horrendous quality and engineering quality with products, but it is also a known issue with many other A/V pieces of gear and wireless connectivity.
If it is a wired connection, then you may have something else going on, but this most often is the scenario with wireless devices and cheap routers. It may be worth it to upgrade to a better wi-fi router for your home. Perhaps try a wireless bridge and give your TV a hard wired connection to that instead.
Good luck with the LG.
