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I hear you, it's awful when you're stuck trying to figure out a sudden change like that. A couple questions, since I'm curious about what would cause such a drop for so many clients. If you haven't, you may need to break out a spreadsheet to track the changes and try to find the pattern.

1. I'm guessing you checking Moz and google search console for crawler errors? (First thing to rule out here)

2. Are you assuming that the issue is an algo update because you are having the issue for multiple clients? Or does the changes you've seen also line up with the dates of recent Google updates? Wondering since the last big update was a while ago in June now. You may be able to track down the date of the drops, which may give you more information about whether/what changed on that date.

3. Have you ruled out other reasons that these sites could have suddenly dropped in the rankings? This Moz post and this Content King post both have some tips for other issues that could have caused the drops.

There are a couple reasons this can happen! It can mean the Moz/ahrefs crawlers attempted to recrawl that link and weren't able to. (It doesn’t necessarily mean the link has actually been removed, just that they couldn't find it on that crawl attempt.)

Arefs has a good guide here for understanding "lost" links that you're still seeing. You may be able to identify the issue and get it fixed: https://help.ahrefs.com/en/articles/816350-why-does-ahrefs-report-a-backlink-as-lost-if-i-still-see-it-on-a-page

Moz also has a resource that can help with getting the crawlers. See their FAQ on "Why was my link lost?"  https://mza.bundledseo.com/help/link-explorer/link-building/discovered-and-lost

A few ideas/questions for you:

1. Have you tried adding a phone number on your home page without the spaces? The front page on your website only includes the phone number WITH the spaces. It might look odd, but you could try putting the phone without spaces into your footer, perhaps near your copyright or the address.

2. Have you tried updating your business on Google? Updating your own GMB profile can help you appear in results and make sure Google isn't confusing you with this other similarly-named company.  https://www.google.com/business/

3. Also I took a peek at your search results and when I checked your business on Google Maps, your phone shows up with spaces but also with a +44 code in the beginning. I wonder if that could be part of the issue as well.

Hope one of these ideas help!

A few ideas/questions for you:

1. Have you tried adding a phone number on your home page without the spaces? The front page on your website only includes the phone number WITH the spaces. It might look odd, but you could try putting the phone without spaces into your footer, perhaps near your copyright or the address.

2. Have you tried updating your business on Google? Updating your own GMB profile can help you appear in results and make sure Google isn't confusing you with this other similarly-named company.  https://www.google.com/business/

3. Also I took a peek at your search results and when I checked your business on Google Maps, your phone shows up with spaces but also with a +44 code in the beginning. I wonder if that could be part of the issue as well.

Hope one of these ideas help!