@DaraghOt, HAPPY FRIDAY and welcome to 3Community. Regarding 5G broadband, not only do you need a 5G router but you also need a 5G Plan.
Let me know which one you have and we'll go from there 💪
That is a weird one @DaraghOt I'm guessing that you have done all the usual? Switched off router and so on?
Out of curiosity have you done a speed test too? If so, what are the results?