Amazon are constantly making changes to the Firestick via system updates. Sometimes they push down applications that we dont want (and we can’t remove) or they change permissions so that things that were working before (Custom launchers!) don’t work any more.
If it possible to uninstall system updates and also clear the app cache
(APPs at the bottom of the page)
Steps to confirm your Free Space
1. From the Main Menu scroll to hover over Settings.

2. Click My Fire TV.

3. Choose About

4. Check your free space

Install the APKs from the link below
Software Needed
Dangbei Assistant
Cache Cleaner
MiXplorer
Total Commander