Idle session causing LB session to move on another server in the LB pool

We have observed that if session is idle for more than 3 minutes, it gets disconnected /transferred to another server in the pool.

universal persistence timeout is 180 seconds by default.

root@(ve11a)(cfg-sync In Sync)(Active)(/Common)(tmos) list ltm persistence universal
ltm persistence universal universal {
    app-service none
    mirror disabled
    rule none
    timeout 180
}