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Perhaps it’s time for outside IT assistance to finally get it right & stable.
It appears to be slowly dying. The fixes are not getting the system back up to prior performance. My guess is it is overloaded on the back end. There’s lots of data and more data every day, so the queries take longer and longer. Then there’s some kind of timeout to return a partial page both to avoid hanging up the front end and using up all available sockets making the back end unavailable even for maintenance.