pacmac

This is my configuration:

# Crete separate routing tables per interface
echo "1 vlan13" >> /etc/iproute2/rt_tables
echo "2 vlan1" >> /etc/iproute2/rt_tables
# Add route to tables
ip route add 10.0.13.0/24 dev br0.13 table vlan13
ip route add default via 10.0.13.1 table vlan13
ip route add 192.168.2.0/24 dev br0 table vlan1
ip route add default via 192.168.2.1 table vlan1
# Add rules based on the origin to use the correct table
ip rule add from 10.0.13.2/32 table vlan13
ip rule add from 192.168.2.50/32 table vlan1

Modify it for your use case, test it in a shell and when it works for you, just save it in /boot/config/go and reboot.

Changed my Unraid address from 10.0.13.2 to 10.0.13.5. No more problems in 4 hours. I don't understand why. The address was not used by any other machine in my network.