No need to delete, especially since the original post now has replies, you can delete the post but not replies, so it would look weird.
There is a known issue in the US with T-Mobile and Sprint providers, looks like these providers will default to IPv6 addresses only, which does not work well with Hearthstone. I see you posted your Tech Support question on the EU server, so presumably you are not in the US. However, I could believe that some European providers behave similarly.
So if you have made recent changes (new phone, new provider, new data plan, etc.), it could explain it. You could have a look at the workaround I linked to in that thread, maybe it will help you.