SAS Enterprise Guide sessions that are inactive to the SAS Viya platform Compute session might disconnect. 

Here is how SAS Enterprise Guide is supposed to currently work regarding Compute session timeouts:

• The Compute session launched by SAS Enterprise Guide times out after 90 minutes of inactivity by default. (See below for instructions about how to change this setting.) Note that this refers to inactivity in the Compute session, not in SAS Enterprise Guide. So, if you are working in SAS Enterprise Guide (that is, typing in the editor) but not performing any actions that call into the Compute session (such as submitting code or opening data), the inactivity timer is not reset.
• The Compute session never times out while actively processing, as this is considered activity.

To change the default Compute session inactivity time-out (90 minutes) used by SAS Enterprise Guide, set the Viya_ComputeSessionInactiveTimeoutSeconds configuration property in the SEGuide.exe.config file, which is located in the SAS Enterprise Guide installation directory. By default, this path is as follows: C:\Program Files\SASHome\SASEnterpriseGuide\8.
Note that this process might require local administrative rights to edit the SEGuide.exe.config.

For example, adding the following to the SEGuide.exe.config file changes the time-out to three hours instead of the default 90 minutes:

  <appSettings>

    <add key="Viya_ComputeSessionInactiveTimeoutSeconds" value="10800" /> <!-- in seconds -->

  </appSettings>