Amazon Fire 7 Tablet running out of space

Hi All,
I’m using an Amazon Fire tablet with Action tiles for an alarm panel. I have been using it for about 5 months and now the tablet is starting to complain about low memory. The only thing that is running is Fully Kiosk. When I go into the storage settings, 85% is being taken up by the system OS and not apps. Any ideas about what is bloating the OS and how to clean it up?

Did you get no response at all on this?