Admin web UI hangs and crashes

After a short while of browsing about the admin web UI, it throws up a huge red banner about aborted Ajax requests, after which the browser cannot open the page. So far I found only one way to restore service: to reboot the freepbx box. Is this a misconfiguration on my side or a bug in v. 17?

apachectl restart also works.
Or it does not as it did not moments ago, having worked 1 1/2 hour ago.
Is v.17 not production-ready? Which version is?

Restarted the box, and got this in the main screen of the UI:
image

This thing does nothing but crashing.

And then this: