SQL Maintenance Plan - Differential failining

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
franco2Asked:
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Vitor MontalvãoMSSQL Senior EngineerCommented:
The full backup is going to the same share and folder?
If affirmative, is the same user that runs the full and differential backup jobs or you have different user for each job?
franco2Author Commented:
Affirmative and yes same user.
Vitor MontalvãoMSSQL Senior EngineerCommented:
That's weird. This only let you with a network issue that only happens during differential backup (even more weird).
There's more detailed information in MSSQL Log and OS Event Log?
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franco2Author Commented:
SQL Log
***************
Date            12/3/2015 12:00:07 PM
Log            SQL Server (Current - 11/5/2015 7:19:00 AM)
Source            spid69
Message
Error: 18204, Severity: 16, State: 1.
***************
Date            12/3/2015 12:00:07 PM
Log            SQL Server (Current - 11/5/2015 7:19:00 AM)
Source            spid69
Message
BackupDiskFile::CreateMedia: Backup device '\\roadrunner\honeypot\SMBBackupShare\BBNC\BBNC_backup_2015_12_03_120003_6769942.bak' failed to create. Operating system error 59(An unexpected network error occurred.).
Vitor MontalvãoMSSQL Senior EngineerCommented:
In the main question the error was:
  Operating system error 64(The specified network name is no longer available.).

Now changed to:
  Operating system error 59(An unexpected network error occurred.).

If really seems to be related to a network problem.
By the way, did you check the available free space in the backup share? You may also run out of space there.

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franco2Author Commented:
3+ TB available - a reboot may resolve the issue - thx
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Microsoft SQL Server 2008

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