Sims 4 Mods Disappearing

The last couple of times I have been playing The Sims 4, I have noticed that my custom content that I have downloaded started to slowly disappear in my game without even deleting the content. It would just do it on its own. Whenever I would load my sims, it would say content would be missing, and some of the clothing items would disappear. I have tried to use sims 4 tray importer, but it currently is not working with my system as I use a mac. If anyone has any idea on what to do or how to locate the missing cc please let me know as this has been an ongoing issue!