Fire tv gen 2 with only about 1gb free space and I get the low memory popup. I only use it for kodi. Kodi was only 900 mb and I downloaded maintenance tool and cleared thumbnails, cache and purge packages, and I now have 1.7gb free space but all my other fire tv devices that have same setup and useage all have over 3gb available.
I also used es file explorer cleaner. It didn’t find much.
Not sure what else to try short of factory reset and start from scratch.