Not sure if related to this but alot of ISPs in different countries are switching to using “CGNAT” for users that don’t require a static IP so you might have to purchase a static IP or see if you can opt-out from “CGNAT” hope that helps.
Background about CGNAT:-
Carrier-grade NAT (CGNAT, also known as large-scale NAT), is a method of sharing a single unique public IP address with multiple services to allow providers to extend their pool of usable IPv4 addresses. This means your modem or router will be assigned a private IP address instead of a unique public IP address. Our network will then translate that into a shared public address allowing you to access the Internet.
In summary if you want to host something & your ISP is using CGNAT you will either have to ask your ISP to disable CGNAT on your internet service or pay additional for a static IP.
Good luck hope this information helps hopefully you can google etc to see if your ISP has recently transitioned to using CGNAT.
Made an announcement post here to help others as thought it was useful news 
