Connection to the server has been lost

Did you try clearing the browser cache of Internet Explorer (the game uses those) ? Also make sure that Firewall and/Or Anti Virus don't block the connection.

If the issues still persists, I would contact customer support so they can take a look at your account.

The AnswerHQ is about Users helping Users.

They can be found here: https://help.ea.com/contact-us/ask

Choose a category, a game and a platform for the contact options to show up.

If live chat is gray, change your country to US and make sure you're on US Business hours. It might also gray because they're very busy. Try later.

See this post if you have trouble with the site: http://sims3.crinrict.com/en/2012/10/how-to-contact-ea.html

What do we do now that Internet Explorer doesn't exist anymore? Clearing Microsoft Edge doesn't seem to do anything.

hitokirinome  The equivalent is to clear Edge's Internet Explorer-mode data, as described towards the end of this article:

https://support.microsoft.com/en-us/microsoft-edge/view-and-delete-browser-history-in-microsoft-edge-00cf7943-a9e1-975a-a33d-ac10ce454ca4

Since this thread is very old, I'll lock it here.  If you still need help, please create your own thread describing your issue and listing the troubleshooting steps you've tried that haven't helped.