Welcome to the Q&A Forum

Not happened to my sites, so pinch of salt and all that. However, imo, root cause of this could be a number of things, but is likely a resource limitation on the hosting. Slowing down the crawl may well fix the 504 issue, but if your SEO is a glorious success and the site gets more traffic, then you may be looking at 504's again. A 504 is a timeout and the problem is server side not with Moz. Made any recent DNS changes? Check your DNS health at something like https://mxtoolbox.com/domain/ Firewall active? Could be it doesn't like Rogerbot. Logs should be telling your tech team what's going on WordPress? Occasionally database corruption will cause 504's If your team isn't able to provide a little more memory (likely culprit to my mind) then consider implementing caching; this will lighten the server load and also load pages faster to boot; good for users and SEO.

Hi there! Kristina from Moz's Help Team here. I noticed that you're currently in conversation with my colleague, David, who is helping you out on this. It looks like he might have an idea of what's causing this to occur and he's waiting on the Crawl Test results to confirm if it's fixed for you. I'll let David continue assisting you on this one, but as always you can reach out to our team with any technical issues such as this one by emailing us at help@moz.com. Thanks so much, -Kristina

It might be that your updated title tag language is decreasing clicks through to your site - so you're still ranking the same, but not as many people are clicking. Since you're wanting to target a more qualified audience, this dip in traffic might not be a bad thing if you're seeing a higher conversion rate or more qualified leads. If you're running AdWords, it might be worth testing both versions of the language from your title tags in ads to see if that is impacting your click-through rate.