Hi there,
The majority of DFSR issues arise because of active directory replication issues, inadequate staging quota, sharing violations of open files, a corrupted DFSR database, unexpected dirty database shutdowns, conflicting data modifications, and accidental data deletion
DFSR Troubleshooting: Handy quick tips for your reference:
https://social.technet.microsoft.com/wiki/contents/articles/31558.dfsr-troubleshooting-handy-quick-tips.aspx
I hope this information helps. If you have any questions please let me know and I will be glad to help you out.
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