There are several things that can cause issues with WAN Balancer if they are not set properly. Some of the common things are listed here:
- Make sure each ISP's interface has "is WAN Interface?" checked at Config > Network > Interfaces and has all required information properly entered.
- If installed, verify WAN Failover has tests set up for each WAN connection.
- Also verify your interface weights are set properly in WAN Balancer.