"Save draft" freezes wordpress

In the past two days, intermittently when I try to save a draft, wordpress freezes. AND, the rest of my internet then freezes too! But it is always started with wordpress, trying to save a draft. The only way to get things going again is to restart my computer. Sometimes I find the draft edits actually did save, other times they did not. It doesn’t happen every time I save.

I tried this on another computer in my house and had the same problem.

I am using Mozilla Firefox.

Suggestions?