QB Issue Resolution:

This error message happens when the Intuit Sync Manager has a damaged or missing program file. However, since it was discontinued on May 31, 2016 and is no longer accessible, you can disable it. Here’s an article for more details on how to disable Intuit Sync Manager: https://community.intuit.com/articles/1019636.

Resolution for Issue 'what causes ( cuseruserlocalintuitsyncmaster) error. i get this at lest 1 or 2 time before my company file will load?' available: Yes (Solved).
Source: Intuit Community forum.

what causes ( cuseruserlocalintuitsyncmaster) error. i get this at lest 1 or 2 time before my company file will load?: 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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