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Thank you for the responses. I figured it can't be a good thing, but they made it sound like it wasn't impacting user experience because the switch to the available nameserver was immediate. It still seems to me that if Google Search Console is flagging 503/4 errors daily, as well as Bing WMT, there may be an issue. If it were only Bing, Google or MOZ I wouldn't be as concerned. Heck, I even ran a ScreamingFrog scan last night and got a handful of 504 errors. Going to be reaching out to them today to see about a fix. Thanks for your replies.

Thanks for the information. I don't know how to and don't think I have access to change those settings on my sitemap with my current website provider. I'll send this information to them and see if they know what the problem is. Google seems to update daily, so there must be a setting that Bing doesn't like.

Thanks, was able to get it done on most of them but a few I don't think I have the ability to add the no index with how my CMS is setup so will be working on trying to include unique content to those pages. Thanks for all the great advice.