The site is now running on a completely different server than it was a few weeks ago. The problems that were affecting the old server are gone and the site has been working well.
However, there is a big difference in the utilization of the server. Before we were running on our own server that, when it was working properly, had ample resources available. The response was very fast and the server was never even moderately loaded.
The new server is shared with many other sites and can be heavily loaded during busy times. The new server just can't process and reply as quickly as the old server when it is busy.
I have spoke to the host about the server loading and they will make adjustments over time to balance the load.
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