I'm using SharePoint's built-in backup. All goes well but I get this kind of error:

Object Search Service Application Dev failed in event OnBackup. For more information, see the spbackup.log or sprestore.log file located in the backup directory. 
SqlException: The operating system returned the error '64(failed to retrieve text for this error. Reason: 15105)' while attempting 'FlushFileBuffers' on '\\rcbapp01\SharePoint2010 Backup\dev.intra.aprc.org\spbr0054\00000121.bak'. 
BACKUP DATABASE is terminating abnormally.

On database backups. But not all database backups, some of them in the same job will go on. Not the same DB all the time, either. But about one each backup job.

The SQL user agent user has full rights on the share. In fact, 'Everyone' has full rights on the share, both sharing and permissions. I suspect that this may be some kind of performance bug. OK, but if it is, what's the bottleneck and how do I fix it?

Have you seen this error before?

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According to MS docs, there needs to be a latency of no more than 1 millisecond between server. – mmcglynn Jun 8 '11 at 17:21
The network admin and I actually had a go at LANMAN and extended the timeout. Never did get this fixed in the end, but I've noticed that this is happening on one of the big databases in our production farm. – Dan Jun 28 '11 at 9:08
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