RE: We were unable to start a conversation with..
Have either of you installed some new networking hardware (modem, router, switch, etc.) or installed a new firewall recently? Or possibly even changed something in your network settings or created a new VPN? To me it sounds as though the messages are being blocked, likely something to do with your software or hardware as this message can occur when a message is being received from another person when you signout (I find this to be the common source for me getting this error).
Apart from that, did you install any new software or update any software just before this started happening?
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