Amazon fire stick cache settings for kodi

HI all, recently got Amazon fire stick, added kodi. Installed repos etc, streamed a show and the firestick ran out of storage space and crashed. I was unable to reopen it without wiping all the data and starting again.

My question is , what is the best cache setting for the firestick to stop this happening? I read different things everywhere about xml settings and changes to cache.

Please can someone tell me very simply what to do and how to do it? bearing in mind that I am a noob! I have no idea how to get to or edit xml stuff, I read that I need to create a file- how is this done? On the stick or a pc? ! Pls help!

Thanks!