Has Spectrum Cable Internet started blocking inbound traffic

[swb_mct]

THIS IS AT AN UNOCCUPIED SEASONAL HOME . . . WE ARE NOT THERE NOW
We have about 20 IP Cameras plus access to HAI OMNI2 PHONE APP app and other things that are accessed by Port Forwarding through our router. Had this arrangement for 20 years and yesterday it stopped . . . no inbound traffic gets to our cameras or other systems. Outbound internet works because our Ring cameras and Generator communicator are still working which are OUTBOUND CONNECTIONS.

THIS IS THE SETUP . . Port translation is used so only ports above tcp 45000 are facing the internet directed. Very little scanning observed in this port range. None of this stuff works now but outbound connections still work.

 

[Frunple]

It's not possible to block "inbound traffic". They can block inbound ports but ethernet is a 2 way protocol so blocking one way would stop all traffic since the outbound would never receive a reply.
But anyway, I think the first thing to verify is that your public IP didn't change. You say you aren't there but do you have a way of verifying the IP there? Maybe Ring or the generator?
One thing I would recommend is to setup a VPN connection between houses or even just a remote access into the seasonal home at least.
I can't imagine having all those ports open when there's no need to. Most store bought routers have a built-in VPN capability so should be easy to do.