Browser keeps refreshing tabs
Definitely those tabs are just getting killed. Remember that in Chrome, page renderers run in separate processes for security. Once a renderer process has been put into background, the system is free to kill it. According to https://code.google.com/p/android/issues/detail?id=98332, the issue with over-aggressive process killing should be resolved in the 5.1 update. Hopefully, LG will release this update for V480 soon.