Here you are. Forum topic:
Some blogs covering how difficult it is to keep up the supply chain (for other modules, but the essence is the same; the official information regarding bottom modules was only sent out to customers via e-mail):
Fairphone 2 camera module out of stock - Fairphone, How we are fixing the spare parts supply chain so you can repair your Fairphone - Fairphone, A closer look at the spare parts supply chain - Fairphone, Supply chain stories: What happened with our phone displays - Fairphone