Ubuntu vpn connects successfully and shortly thereafter fails – network traffic stops – either VPN and local network

I’ve started to use Ubuntu for my job needs and experienced first pretty annoying challenge with VPN connection. I’m using openvpn client with network manager. After successfull connect to VPN server I can use local and remote networks with no problem. After a while – like 1 -10 minutes , sometimes a bit longer up to couple hours or sometimes…

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