I can no longer get into my Fortnite account?

I was once thrown out of a round because my internet was gone for a moment. Then I wanted to go back in, but it said: "Successfully logged out". I thought nothing of it and wanted to log in as normal. But it was there: Your login details are unfortunately invalid "although I wrote everything correctly. Then I thought maybe someone had scampered in with me and so I forgot my password. The email arrived and everything went well. When I had chosen the password, however, it said "Unknown error". I have to say that I'm now a bit scared of my account. Can someone please help me?

-Thanks in advance

If you can't find an answer here, which I suspect, contact Epic Support. They respond quickly and are super nice.