I updated to 17.4 last week, and it worked just fine. As of yesterday the wife and boy tried to search a movie and it just kept going back to the main screen.
I tried tonight for twin peaks same thing happened........any help/tips?
A friend told me his stopped working recently, too. I bet your piracy plug-ins, etc, have been disabled.
I found this: https://kodifiretvstick.com/fix-fire-stick-kodi-not-working/