Is anyone else having problems with the app/website?

I booked a flight two weeks ago but was debating adding a day or two to my trip. So I went onto the “change flight” section of the app and it wouldn’t load. I went onto the website and tried as well, every day for a week. I haven’t been able to get the app or website to load the flight exchange so I guess I just won’t change it? Has anyone else noticed this issue??