Ensuring reliable raw material supplies of a consistent quality is an important issue in operating a plant.
Problems with supply can always be overcome by carrying sufficient raw material stock as a buffer, giving you time to resolve issues or find alternative supply.
In recent years, however, the importance of developing relationships with your suppliers has come to the fore. By spending time discussing what the suppliers can offer and what you require, quality problems can be avoided, supply arrangements better coordinated, and new opportunities identified.
You will need to decide how far you go with each of these approaches!