ipsec vpn still not working after 4.73 Patch 2 update



I have around 7-8 vpn tunnels between zyxel USG60W , Azure, zyxel flex, etc

Even if I see vpn tunnel established, there is no inbound traffic through the tunnel.

This is totally random. Today there is a vpn tunnel not working , next day another one, after restart the vpn tunnels which worked do not work anymore, etc

What is the problem ? Is there any fix for this?

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