CRM 365 max pool size was reached

Hi there,

We have installed CRM 365 for our production environment. Three machines used:

• DB: 64 GB Memory, 24 Core CPU
• Frontend: 32 GB Memory, 16 Core CPU
• Backend: 32 GB Memory, 24 Core Cpu

As indicated, the resources are good enough and no lack of resources occur. We have daily number of 80K cases in CRM and 700 users working with system.

Every time our CS experts try to assign 100 cases, the following error occurs:

The timeout period elapsed prior to obtaining a connection from the pool.  This may have occurred because all pooled connections were in use and max pool size was reached.

I have checked lots of records in deployment properties table and also check the config files, but could not find any configuration to be able to handle this error.