Can you check your storage in setting ( 2 cogs), then other and more setting. Then scroll down to storage and here you can check if it's nearly full. If it is and it's mainly misc files then you need to clear packages inside kodi. To do this you need to go inside kodi then either areswizard or Xunity maintenance. Inside these you need maintenance and clear packages. Also clear cache aswell and see if this helps.
If not you can go back to setting outside kodi and again go other, more setting and this time go to Apps and then kodi. Click here and force stop and then clear data, wait for it to clear and then go back to kodi and run the wizard. It's a good idea to do maintenance every week and to clear cache daily.
Good luck