Our potential customers are unable to reach our website from Virgin Media Home Broadband connections (with an error unable to establish a secure connection). Switching to mobile data works fine. We have some reports that customers are experiencing the same from Sky Home Broadband customers too having a massive impact on our business.
A common reason why people might not be able to connect to your site from one network while it works over mobile is a faulty DNSSEC configuration. However, that is certainly not the only possibility.
Since you have not shared you domain, we cannot check that for you. You can check for yourself on https://internet.nl.