Kodi gets unbearably slow if it’s been on for 24 hours.

We leave Kodi running non-stop on our HTPC system. When it first starts up even for the first few hours you can move thru the menu fine. At first this happened with the default skin and plexkodiconnect. I figured the addon was causing the issue so I switched to plexbmc and the Amber skin. It’s still doing the same thing. The only other addon I have installed is the Rom Collection Browser program addon.

This is on Ubuntu 16 with an i7 cpu, 16gb of memory, samsung 850 pro ssd drive, and 750ti gtx video card.

Any idea why it would do this and how to fix it?

Thanks.