When it comes to your internet connection and remote access, it’s not just about what your configuration looks like but also about a number of other „players“… namely your internet provider. They can change a lot of things on their side that can impact your remote access — up to the point where they break it for you.
You can check out this thread to pin down what’s causing your issue. Though your description implies this might be due to a change on your internet provider side.
