I have version 19.4.433.
Fun, fun: I'm now seeing what you are seeing. I started Chrome (which was happy yesterday) and left it for a bit tonight and there was the message again! I then closed Chrome and restarted it, and initially got no message. Left it a bit longer (as you did) - about 5 minutes - and hello message!
Whatever is happening doesn't look to me to be a problem with our systems. I suspect an issue at Google that Avast might want to mention to them.