We received some alerts late Monday evening (2019-09-09) that were showing some 'odd' behavior on several different sites.
We have been working with server techs to identify the problems.
At this point it looks like the problem is related to an extension that is used on several different sites and may be causing memory issues on the servers.
We've been implementing some 'work-arounds' to get the sites functional while we dig deeper into the cause and solution.
Once we have a solution we'll post update here and directly via support ticket.