For the issue of “WAN shutdown”, it is related to Balance One failed to ping the health check target. The health check tools is used to monitor the WAN status for WAN failover purpose. It is same when you issue a ping from your laptop to a target IP address then got the “Request timed out” (Balance One is showing “WAN failed PING test”). You may refer to the link below for further troubleshooting.
For the issue of client active session, 1065 sessions should be accepted. These are the sessions that generated by the client. You may go Status > Active Sessions > Search to check what sessions are generated by the client. You may need to take action to the client if the generated sessions are not legitimate.