I have a similar issue (now Case # 02197442) using a SAS attached HP2600 array.
I tried the change to the TCP/IP parameters, however since this is direct attached storage, I don't know that it would make any difference. I also tried upgrading to the latest & greatest 9.5 Update 2 to see if it would make any difference - no dice.
I have not yet removed the MS KB4015553 as I wanted to see if U2 (not the band
) would help.
One question to those that had experienced the error - what was the size of the machine? My other backups are running fine; the VMs in this case are multi-terabyte servers (3TB +) and I did't know if perhaps the file size was an issue.
Thoughts? Open to suggestions...