We experience severe server issue, all caused by Nginx!
Please read 'excerpt of email correspondence' transmitted by our provider and respond to it shortly.
I am sorry to hear of all the trouble that you're currently having with the server. I spoke with B. this morning regarding the issues that started last Friday. As I explained to B., it actually is one of your plugins that uses NGINX. We do not use or install NGINX on any servers unless specifically asked for. It seems you have a number of plugins that use NGINX because they come from WPMUDev, but the one that currently is having the most issues is your Snapshot plugin.