QB Issue Resolution:

Sounds like one of the machines is going to sleep. Try changing the sleep settings in the Energy saver control panel in Apple System Prefs. Put it on Never and see if that fixes it.

Resolution for Issue 'We have 2 computers that use multi-user mode. One of the users is connected via WIFI to the Server. If this user is inactive for 5 minutes, he is logged out and has to log back in. Is there a setting to increase this time or could it be a network issue?' available: Yes (Solved).
Source: Intuit Community forum.

We have 2 computers that use multi-user mode. One of the users is connected via WIFI to the Server. If this user is inactive for 5 minutes, he is logged out and has to log back in. Is there a setting to increase this time or could it be a network issue?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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