Hello inbloomwithyou,
I had the same issue with my LG UJ6300.
I took some advice I read on this site and I reset my tv from factory settings and went in and turned off the Quick Start. Sertings/General/Quick Start (toggle to off). I haven’t had a problem with this since.
Also important to note that when i used my cable remote to turn off the tv it doesn’t actually turn the tv off. I find when I turn the tv off using it’s remote it clears the cache.
Hope this helps.