Aftv kodi slow down

Hey all
I'm having some issues with both my fire TV and fire TV stick. I've installed kodi, plus genesis and a few other add ons on each and changed the skin (aeon nox silvo on stick and titan on fire TV gen1), updated the library with some of my favourite shows and over time it seems to be getting slower and slower, particularly when I try to add a new repo, along with freezing during startup updates if I'm trying to do something at the same time, eg. Watch a TV show.

I wondered if anyone else had been having any similar problems? And whether there was any possible fixes?

Thanks all :)

AFTV and USB Flash drive

Now it's been probably ask before,but can I use a USB flashdrive on a aftv gen1 with newest software update or not!I really I read every thing for hours how to do it,but I can't get my aftv to detect the USB drive. I am about to get crazy!