Im Getting the same message too. It may have something to do with a bug in the new update. How long is it before your system says the app needs to restart? For me its a few seconds.
My LG tv keeps on repeating that the app is restarting to free up more space on whatever app I'm on and it happens every 10 seconds so I can't even look at the settings. It even happens when I'm on my ps4 which is on HDMI 1. Any Ideas?