Great news!
So on Sunday, I just hit the reset button on the router, then the game showed me online, but I couldn't play rounds/access course menus.
Later on Sunday, it showed me offline.
Last night, I was still offline, but ps4 network connections showed everything being a-ok.
So I fully unplugged router for a few minutes, then re-plugged in.
Game works like it should again, yay!!!
First thing I did was Save Local those courses of mine that I hadn't backed up, so I could play them anytime I want to. Phew!!
Thanks for your help yesterday, Yeltzman. You have always been one of our community's greatest contributors, helping people out when you can, and providing useful feedback. Now that I'm back online again, I can enjoy your excellent collection of Open RCRs.
