If there is one device which is not impacted then it is not a problem with all devices. The problem is therefore isolated to a subset of all devices. Perhaps th

If there is one device which is not impacted then it is not a problem with all devices. The problem is therefore isolated to a subset of all devices. Perhaps that subset is the majority of all N4s, perhaps it is a small fraction. We don't have enough data to say one way or another.