Simultaneous problems from three different factories in three different states isn’t passing the smell test. After years of no problems to have a complete breakdown? Either some cost cutter changed the process, or they are being sabotaged. Either a management problem or a union problem. But they need to figure out which and focus on people, not equipment.
Not bloody likely it is an accident.
Shut down all the plants and fire everyone. See what happens. Start over.
Likely extortion.
Union sabotage?