Hello, did you ever find a solution to your issues? We have been having similar issues popup on our instance of 10.5.1 Server. We get similar error messages on services though our server takes an extra step. After those error messages, frequently, the entire server freezes and requires a restart in order to get it going again. Causing all services to be unable to load on maps. It's been happening for months now but only over the past week or two, this has started to occur 10+ times a day. We started a ticket with Esri support however they haven't been able to narrow down the issue yet. This also only happens in our Production environment only. Thanks for any insight you can provide.
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