I find myself scratching my head here too as a distant observer, and someone no where near Chicago - thus, unaware of any historical issues.
But there are Chargers running a few places that seem to not have these issues. Maybe on Brightline we would not know because the trains are so small one must be able to go offline and service not be disrupted. But there doesn't seem to be similar stories out of California, or, have I maybe missed them? The Cascade units also seemed fine? That I actually live near albeit service has been so minimal on account of Covid.