Inventory slots of my inventory system just disappear on project restart or randomly

I have an inventory system integrated in my game but here’s the problem in a nutshell:

If I leave Unity idle for a while, or restart my project, more likely than not, the Inventory Slots of my inventory system just flat out disappear - so I’m left with a slot-less inventory system.

The first time this happened I had to re-design my entire system and re-import some assets. Back then, I created some (ok, a lot of…) backups, but slowly the amount of files with this problem are overruling the number of backups I have to override.

Can someone kindly tell me why my inventory slots in my project disappear, and how to solve this problem?

// share code here

Apparently it took me a few days to realize my stuff was not in a ‘Resources’ folder… all good though, for now at least