Why does RabbitMQ becomes unresponsive?

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RabbitMQ 3.7.13 on Microsoft Windows Server 2012 R2 Standard 32GB RAM 48GB page file

Very low utilization - 10 queues , 20 clients , hundreds of messages per day , < 1MB size

Ran fine for 1 year then started becoming unresponsive in a consistent pattern :

  1. Restart RabbitMQ Windows Service
  2. RabbitMQ accepts new connections and processes messages
  3. Connections/sockets start ramping from 940 up to max 7280 in ~10 mins
  4. RabbitMQ stops accepting new connections and becomes unresponsive, dashboard shows 500 Internal Server error

When this started happening 2 weeks ago , restarting service would buy about 24 hours of working time before Rabbit became unresponsive again. But that progressively decreased until now a restart only provides 10 mins uptime.

Looking at server memory history shows some occasional spikes to max capacity.

What could be causing this ? What are some diagnostic techniques to apply ?

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