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SQL Maintenance Plan - Differential failining

Last Modified: 2015-12-04
Anyone know why this would be?  The full backup in the same maintenance plan works but the differential doesn't.  BTW - setup is identical in the sub plan.  Working perfectly for approx 3 months - as of last Thursday getting the following:

Executing the query "BACKUP DATABASE [BBNC] TO  DISK = N'\\\\roadrunner\\h..." failed with the following error: "Cannot open backup device  '\\\\roadrunner\\honeypot\\SMBBackupShare\\BBNC\\BBNC_backup_2015_12_03_160004_2129988.bak’.
 Operating system error 64(The specified network name is no longer available.).
BACKUP DATABASE is terminating abnormally.". Possible failure reasons: Problems with the query, "ResultSet" property not set correctly, parameters not set correctly, or connection not established correctly.

I think it is the double wacks - but the full works without issue
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