QB Issue Resolution:

I suspect that you have 4 Ethernet connected PC’s either connected directly yo the BT router or a switch which also has a Ethernet connection to the router.

One of your replies makes me suspect that the pc’s are dropping the Ethernet connection due to non use over a period or the pc;s is dropping into suspend or hibernate.

Next time this happens also go to the port for that pc and see if both the led’s are green there are two led’s for each Ethernet port.

These symptoms seem to be Ethernet related rather than a QB issue.

Resolution for Issue 'QuickBooks Aborts in Multi User Mode' available: Yes (Solved).
Source: Intuit Community forum.

QuickBooks Aborts in Multi User Mode: 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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