Yeah mine was vlaned off from everything else and ethernet connected. I factory reset it and took it off the internet completely, but the problem still pops up every couple of months. Unplugging it and letting the capacitors discharge (like 15-20 minutes) seems resolve it for a few weeks but it just happens again.

Glad you got a good one, but the issue is something that apparently plagues their TVs. Just looking around on forums for "LG out of memory" and you'll find people with a ton of different models and firmware versions complaining about the same issue. LGs fix for it also hilarious cause they're like, "Have you tried deleting all your apps?" Which really is just admitting they have no clue why it keeps happpening.