In 7200VXR routers you have two buses. Each bus has so called "bandwidth points" budget of 600. Each port adapter inserted into router has bandwidth points requirements, i.e. it takes some of the bandwidth points out of the budget.
You have put all your port adapters onto single bus and have overloaded it, while other bus is empty. All you need is to rearrange port adapters so they occupy evenly both buses.
Here are two documents, which provides more details on the topic:
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...