WordPress hangs if I edit a Post

Hi there, I’ve noticed this problem for months now and am finally getting a chance to post about it. My site is https://puppeteersofpugetsound.org

If I enter some text and a photo and save it, and then make any kind of change (to the text or photo), Word Press will hang when I attempt to save, preview or publish. The little spinny thing just spins.

Any suggestions?