SFOS 19: RED and OSPF every few minutes a new Election

Hello Community,

I have a Sophos Firewall (SFOS 19) which have a RED Tunnel to another Sophos Firewall (also SFOS 19). OSPF is in general working, but every few minutes both firewalls the Firewall initiates a new election, that will cause a interruption in the access to the remote site for a few seconds.

In the ospfd.log I see the following:

2022/05/23 23:02:26Z OSPF: nsm_change_state(192.168.4.2, Full -> Init): scheduling new router-LSA origination
2022/05/23 23:02:26Z OSPF: DR-Election[1st]: Backup 192.168.239.249
2022/05/23 23:02:26Z OSPF: DR-Election[1st]: DR 192.168.239.249
2022/05/23 23:02:26Z OSPF: DR-Election[2nd]: Backup 0.0.0.0
2022/05/23 23:02:26Z OSPF: DR-Election[2nd]: DR 192.168.239.249
2022/05/23 23:02:26Z OSPF: DR-Election[1st]: Backup 0.0.0.0
2022/05/23 23:02:26Z OSPF: DR-Election[1st]: DR 192.168.239.250
2022/05/23 23:02:26Z OSPF: DR-Election[2nd]: Backup 192.168.239.249
2022/05/23 23:02:26Z OSPF: DR-Election[2nd]: DR 192.168.239.250
2022/05/23 23:02:26Z OSPF: Packet[DD]: Neighbor 10.186.4.2 Negotiation done (Slave).
2022/05/23 23:02:27Z OSPF: nsm_change_state(10.186.4.2, Loading -> Full): scheduling new router-LSA origination
2022/05/23 23:02:41Z OSPF: nsm_change_state(10.186.4.2, Full -> Init): scheduling new router-LSA origination
2022/05/23 23:02:41Z OSPF: DR-Election[1st]: Backup 192.168.239.249
2022/05/23 23:02:41Z OSPF: DR-Election[1st]: DR 192.168.239.249
2022/05/23 23:02:41Z OSPF: DR-Election[2nd]: Backup 0.0.0.0
2022/05/23 23:02:41Z OSPF: DR-Election[2nd]: DR 192.168.239.249
2022/05/23 23:02:41Z OSPF: DR-Election[1st]: Backup 0.0.0.0
2022/05/23 23:02:41Z OSPF: DR-Election[1st]: DR 192.168.239.250
2022/05/23 23:02:41Z OSPF: DR-Election[2nd]: Backup 192.168.239.249
2022/05/23 23:02:41Z OSPF: DR-Election[2nd]: DR 192.168.239.250
2022/05/23 23:02:41Z OSPF: Packet[DD]: Neighbor 10.186.4.2 Negotiation done (Slave).
2022/05/23 23:02:42Z OSPF: nsm_change_state(10.186.4.2, Loading -> Full): scheduling new router-LSA origination

Has anybody an idea what is going wrong?

Thanks,

Ben