I have two ISPs Jio and Airtel connected to ER 605. When I am connecting both the ISPs both with 300 mbps speed, I am experiencing frequent disconnections. 

I have tried using only Link failure (enable load balancing is checked)

and also Application Load balancing without any Link failure rules. 

In both modes I face frequent disconnections.

When the disconnections happen both the ISPs are up and I get internet connections when i connect directly to either of the ISP router

When I force one ISP WAN to be disconnected then there is no issue and everything invluding the Deco mesh works fine. However that negates the purpose of Load Balancer as manual intervention is required for failover. My connections are as below. 

Need advice on what I should try to ensure either load balancing or auto matic failover when one ISP fails.