INTERMITTENTLY Error 22 for write/read access to a file on Active Directory Shared Folder

Hi experts,

  We run our SAP on SQL Server with Windows Server Failover Cluster and I migrated one DC(qrdcsapdc2) to another DC(qrcsapdc7) a couple weeks ago. I found there are many error 22 for write/read access to a file on AD Shared Folder from 9/8 2:00am ~ 4:00am

The first weird part is the timeframe is very regular. Its occurred only from 2:00am ~ 4:00am(9/6 2:30am happened, too)

1. The second weird part is we have 7 Additional Application Servers(tccap51 ~ tccap57) and it occurred only on 3 AASs(tccap53, tccap54, tccap55)
2. By the way, I have disable 8dot3name(fsutil 8dot3name set S: 1) according to SAP note 662452 on 9/6 but I have not restarted OS yet.

File = \\tccprd1\sapmnt\TCP\SYS\global\218JOBLG\0001X01450800X50446

Cannot close the file of a TemSe object (error no 22)

Possible causes & solutions?

1. Something wrong on Active Directory(DC) authentication issues and I prepare to restart all DCs, DBs and AASs to get new authentication tickets.
2. Intermittent network packet loss?
   • Replace with new network cables and switch ports
3. Others….

Please help. Any comments are appreciated.