Some "buttons" don't work.

In the recent past, ten days or so, I have had to resort to attempting a response to an OP to get to a log in page. The link at the top right of the Home page does not work on those days. It's intermittent.

Today and yesterday the reply button for comments within and OP do not work. I can't use the button in the lower right corner, even for the OP. I can only respond to the OP and only by using the big blue button at the bottom of the page.