Enter Key Issue

My Enter key started to act weird about a month ago. It can take 1, 2, 3, or 4 presses for it to finally register. It is completely random. For example, if I go into a web browser and type in anything, sometimes I press Enter once and it works as normal. Then I open another tab and type something in, then I have to press the Enter key three times for it to work. When I hold down Enter, it seems to work 100% of the time, but usually, there's either no delay or a slight delay.