I've used Kodi for a number of years, and it's served me well, but I'm afraid the end is nigh. Links constantly getting shutdown, struggling to connect, etc. etc. It just pisses me right off.
I downloaded Terrarium TV, and it's so good. It's not as customisable, but if I'm honest I'm not overly fussed with how it looks, not that Terrarium looks bad, cause personally I quite like how it looks. It's similar to Netflix.
If you're getting pissed off with Kodi, definitely try this out. Here's a link for a tutorial, cause it's a little tricky getting it onto a fire tv box: