Please Help Newbie with “Kodi isn’t available” on Apple TV4

Hi all,
New to Kodi and I installed the latest build on my Apple TV 4 last weekend and all was working fine the few times I tried it but today I am getting “Kodi isn’t available” when I click on the Kodi app.
From a brief search on google I see that it might have to do with app signer (developer), if so I guess I will have to re-install……in that case how would I avoid the same issue again?
Any help is appreciated.

Thank you,
Cali