PBIRS randomly crashes - Could not impersonate the user

Hello everyone,

One of our 3 Power BI Report Servers crash randomly multiple times per week.

It always throw the same error. 

Find below a snippet of the log file "RSPowerBI" stored in PBIRS/LogFiles/ directory:

2020-09-03 11:28:29.2895|ERROR|15|Error getting next eventSystem.ApplicationException: Could not impersonate the user. LogonUser returned error code 8.
à Microsoft.BIServer.HostingEnvironment.ImpersonationContext..ctor(AccountCredentials accountCredentials)
à Microsoft.BIServer.HostingEnvironment.ImpersonationContext.EnterUserContext(AccountCredentials accountCredentials)
à Microsoft.BIServer.Configuration.Catalog.CatalogAccessFactory.NewConnection()
à Microsoft.BIServer.Configuration.Catalog.CatalogAccessFactory.<QueryFirstOrDefaultAsync>d__5`1.MoveNext()

I also had a look at the Windows events and there is always a .NET Runtime error thrown (sorry for the french):

Application : RSHostingService.exe
Version du Framework : v4.0.30319
Description : le processus a été arrêté en raison d'une exception non gérée.
Informations sur l'exception : System.OutOfMemoryException
à NLog.MessageTemplates.TemplateEnumerator.ParseFormat()
à NLog.MessageTemplates.TemplateEnumerator.ParseHole(NLog.MessageTemplates.CaptureType)
à NLog.MessageTemplates.TemplateEnumerator.MoveNext()
à NLog.MessageTemplates.TemplateRenderer.Render(System.String, System.IFormatProvider, System.Object[], Boolean, System.Text.StringBuilder, System.Collections.Generic.IList`1<NLog.MessageTemplates.MessageTemplateParameter> ByRef)
à NLog.Internal.LogMessageTemplateFormatter.AppendFormattedMessage(NLog.LogEventInfo, System.Text.StringBuilder)
à NLog.LogEventInfo.AppendFormattedMessage(NLog.Internal.ILogMessageFormatter, System.Text.StringBuilder)
à NLog.LayoutRenderers.MessageLayoutRenderer.Append(System.Text.StringBuilder, NLog.LogEventInfo)
à NLog.LayoutRenderers.LayoutRenderer.RenderAppendBuilder(NLog.LogEventInfo, System.Text.StringBuilder)
à NLog.Layouts.SimpleLayout.RenderAllRenderers(NLog.LogEventInfo, System.Text.StringBuilder)
à NLog.Layouts.Layout.RenderAppendBuilder(NLog.LogEventInfo, System.Text.StringBuilder, Boolean)
à NLog.Layouts.SimpleLayout.PrecalculateBuilder(NLog.LogEventInfo, System.Text.StringBuilder)
à NLog.Targets.Target.PrecalculateVolatileLayoutsWithLock(NLog.LogEventInfo)
à NLog.Targets.Wrappers.AsyncTargetWrapper.Write(NLog.Common.AsyncLogEventInfo)
à NLog.Targets.Wrappers.AsyncTargetWrapper.WriteAsyncThreadSafe(NLog.Common.AsyncLogEventInfo)
à NLog.Targets.Target.WriteAsyncLogEvent(NLog.Common.AsyncLogEventInfo)
à NLog.LoggerImpl.WriteToTargetWithFilterChain(NLog.Targets.Target, NLog.Filters.FilterResult, NLog.LogEventInfo, NLog.Common.AsyncContinuation)
à NLog.LoggerImpl.Write(System.Type, NLog.Internal.TargetWithFilterChain, NLog.LogEventInfo, NLog.LogFactory)
à Microsoft.BIServer.BIService.ManagedProcess+<ThrottledStart>d__20.MoveNext()
à System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
à System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)
à System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)
à System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
à System.Threading.ThreadPoolWorkQueue.Dispatch()

I've been digging Google but didn't find any relevant information about those 2 errors.

We are running PBIRS January 2020 (15.0.1102.777)

The only difference with our 2 other servers is we have an HTTPS certificate configured on this one.

Everytime the server crash, we have to manually restart the PBIRS Service via the configuration manager console.

Thank you all for your input.