Given the product is approaching end-of-life and there are few alternative supply options, the best course of action is to attempt to resolve conflicts with the existing supplier. Maintaining a stable supply chain is crucial, and resolving conflicts can ensure that the necessary components continue to be supplied without interruption.
This approach is often more practical and cost-effective than other options, such as bringing production in-house or taking legal action, especially for a product at the end of its lifecycle.References
* Monczka, R.M., Handfield, R.B., Giunipero, L.C., & Patterson, J.L. (2015). Purchasing and Supply Chain Management.
* Chopra, S., & Meindl, P. (2015). Supply Chain Management: Strategy, Planning, and Operation.