A company's application is hosted on Amazon EC2 instances within a single VPC across two Availability Zones in an AWS Region. To inspect traffic between the VPC and the internet, the company uses a fleet of traffic inspection instances from AWS Marketplace, deployed in a shared inspection VPC behind a Gateway Load Balancer (GWLB). To reduce costs, only one inspection instance is deployed per Availability Zone used by the application.

During testing, a network engineer observes that traffic inspection functions correctly under stable network conditions. However, during maintenance of the inspection instances, some application instances experience internet session timeouts and are unable to establish new connections.

Which two actions should be taken to resolve these issues?