SBS 2008 VSS Errors during backup - 12289

I manage 2 SBS 2008 servers that are having the same issue. I will post error below.  Shadow copies are not running at the time the backup kicks off.  The backup runs every 4 hours. What's strange is that the backup appears to run successfully.  There are 75+ occurences in the event log every day.  I have not had much like finding a solution online.

Any help is greatly appreciated.


Volume Shadow Copy Service error: Unexpected error VSS_E_WRITER_STATUS_NOT_AVAILABLE. An older active writer session state is being overwritten by a newer session. The most common cause is that the number of parallel backups has exceeded the maximum supported limit. hr = 0x80042409. Operation: PostSnapshot Event Context: Maximum supported sessions: 64 Completed sessions: 8 Active sessions: 64 Aborted sessions: 0 Writer failed sessions: 0 New snaphot set: {003feb1e-91d0-4951-bce6-fac2e166f114} Old snapshot set: {e42e763f-bec5-4101-9d25-13d0bb9efe6b} Old operation: 1014 Old state: 1 Old failure: 0 Execution Context: Writer Writer Class Id: {c2f52614-5e53-4858-a589-38eeb25c6184} Writer Name: SharePoint Services Writer Writer Instance ID: {ed8955a1-e3a7-4fbb-8035-e51745b7590d}