WAN Link Load Balancing - Weighted Round Robin

Good morning people.

I have a 300D appliance HA, use balancing three links dedicated to Round Robin. The links are connected via VLAN on the firewall.

Yesterday the static routes have been removed from the three link at once, causing downtime. It was necessary to restart the firewall to normalize access, suspect a network problem, but would like a review forum.

 

Obs. The routes alternate between them constatamente, would be a common behavior?

Wan load Balancing

 

Interface  Probe Server  Weight  Gateway  LINK EMBRATELx.x.2.350 (50%)x.x.x.1LINK GVTx.x.2.335 (35%)x.x.x.73LINK VIVOx.x.2.315 (15%)x.x.x.x.81ADSL GVT 0 (0%)0.0.0.0   log: 810-19 20:00  Static route is added, Route: 0.0.0.0 0.0.0.0, gateway(x.x.x.73), oif LINK GVT distance/weight/prio(10/50/0)910-19 19:55  Static route is added, Route: 0.0.0.0 0.0.0.0, gateway(x.x.x.81), oif LINK VIVO distance/weight/prio(10/15/0)1010-19 19:28  Static route is removed, Route: 0.0.0.0 0.0.0.0, gateway(x.x.x.1), oif LINK EMBRATEL1110-19 19:28  Static route is removed, Route: 0.0.0.0 0.0.0.0, gateway(x.x.x.73), oif LINK GVT1210-19 19:27  Static route is added, Route: 0.0.0.0 0.0.0.0, gateway(x.x.x.1), oif LINK EMBRATEL distance/weight/prio(10/40/0)1310-19 19:27  Static route is added, Route: 0.0.0.0 0.0.0.0, gateway(x.x.x.73), oif LINK GVT distance/weight/prio(10/50/0)1410-19 19:09  Static route is removed, Route: 0.0.0.0 0.0.0.0, gateway(x.x.x.1), oif LINK EMBRATEL1510-19 19:08  Static route is added, Route: 0.0.0.0 0.0.0.0, gateway(x.x.x.1), oif LINK EMBRATEL distance/weight/prio(10/40/0)1610-19 19:06  Static route is removed, Route: 0.0.0.0 0.0.0.0, gateway(x.x.x.1), oif LINK EMBRATEL1710-19 19:06  Static route is added, Route: 0.0.0.0 0.0.0.0, gateway(x.x.x.1), oif LINK EMBRATEL distance/weight/prio(10/40/0)1810-19 18:59  Static route is removed, Route: 0.0.0.0 0.0.0.0, gateway(x.x.x.1), oif LINK EMBRATEL1910-19 18:59  Static route is added, Route: 0.0.0.0 0.0.0.0, gateway(x.x.x.1), oif LINK EMBRATEL distance/weight/prio(10/40/0)[style="background-color: #ff0000;"]20[/style][style="background-color: #ff0000;"]10-19 18:27[/style][style="background-color: #ff0000;"] [/style][style="background-color: #ff0000;"] [/style][style="background-color: #ff0000;"]Static route is removed, Route: 0.0.0.0 0.0.0.0, gateway(x.x.x.81), oif LINK VIVO[/style][style="background-color: #ff0000;"]21[/style][style="background-color: #ff0000;"]10-19 18:27[/style][style="background-color: #ff0000;"] [/style][style="background-color: #ff0000;"] [/style][style="background-color: #ff0000;"]Static route is removed, Route: 0.0.0.0 0.0.0.0, gateway(x.x.x.1), oif LINK EMBRATEL[/style][style="background-color: #ff0000;"]22[/style][style="background-color: #ff0000;"]10-19 18:27[/style][style="background-color: #ff0000;"] [/style][style="background-color: #ff0000;"] [/style][style="background-color: #ff0000;"]Static route is removed, Route: 0.0.0.0 0.0.0.0, gateway(x.x.x.73), oif LINK GVT[/style]

 

Help please?