Bob, I get that sometimes too.
A reboot while connected usually solves it. Seems it has to do with Avast knowing (is connected to) where my system is and only happens when I reboot my router, thus changing my actual real dynamic IP address. Had that issue for years now.
It's a little hard to reboot the hotels router..... 
Yep, seems that would be the case.... Router IP is what Avast keys on and would be lost if router is disconnected.....
Bob, I meant doing a system reboot instead works if connected during the reboot. A workaround I found some time back.
My bad.
Or, sometimes doing a vps update is all it takes otherwise.