Site goes offline hourly

Hi, for the past month or so, my website goes down for several minutes every hour or so. This morning it was offline for well over an hour. I don't know why it is happening, but I suspect it has something to do with Defender. There is a list of 1000+ WP errors (which I'd like to be able to ignore or confirm so that they are no longer listed as errors) and I'm guessing Defender is taking the site down when it scans.