QuickBooks migration failures can stem from various causes, such as incompatible data formats, software versions, or system glitches. Inconsistent network connectivity or inadequate system resources may also contribute. To resolve these issues, ensure compatibility between data files and QuickBooks versions. Verify network stability and system requirements, and consider upgrading hardware if needed. Backing up data before migration is crucial. Access QuickBooks support or community forums for guidance, and consult technical experts if challenges persist.